Решим уравнения, перенося слагаемые с переменной в левую часть, а числа - в правую.
$$3x - 9 = 0$$
$$3x = 9$$
$$x = \frac{9}{3}$$
$$x = 3$$
Ответ: x = 3
$$-2x + 4 = 0$$
$$-2x = -4$$
$$x = \frac{-4}{-2}$$
$$x = 2$$
Ответ: x = 2
$$5x + 15 = 0$$
$$5x = -15$$
$$x = \frac{-15}{5}$$
$$x = -3$$
Ответ: x = -3
$$7x - 21 = 0$$
$$7x = 21$$
$$x = \frac{21}{7}$$
$$x = 3$$
Ответ: x = 3
$$-4x + 8 = 0$$
$$-4x = -8$$
$$x = \frac{-8}{-4}$$
$$x = 2$$
Ответ: x = 2
$$2x + 5 = 13$$
$$2x = 13 - 5$$
$$2x = 8$$
$$x = \frac{8}{2}$$
$$x = 4$$
Ответ: x = 4
$$-3x + 7 = 1$$
$$-3x = 1 - 7$$
$$-3x = -6$$
$$x = \frac{-6}{-3}$$
$$x = 2$$
Ответ: x = 2
$$4x - 6 = 10$$
$$4x = 10 + 6$$
$$4x = 16$$
$$x = \frac{16}{4}$$
$$x = 4$$
Ответ: x = 4
$$6x + 2 = 20$$
$$6x = 20 - 2$$
$$6x = 18$$
$$x = \frac{18}{6}$$
$$x = 3$$
Ответ: x = 3
$$-5x + 3 = -12$$
$$-5x = -12 - 3$$
$$-5x = -15$$
$$x = \frac{-15}{-5}$$
$$x = 3$$
Ответ: x = 3
$$2x + 3 = 4x$$
$$2x - 4x = -3$$
$$-2x = -3$$
$$x = \frac{-3}{-2}$$
$$x = 1.5$$
Ответ: x = 1.5
$$-3x - 5 = 2x$$
$$-3x - 2x = 5$$
$$-5x = 5$$
$$x = \frac{5}{-5}$$
$$x = -1$$
Ответ: x = -1
$$6x - 4 = 3x$$
$$6x - 3x = 4$$
$$3x = 4$$
$$x = \frac{4}{3}$$
Ответ: $$x = \frac{4}{3}$$
$$5x + 1 = 7x$$
$$5x - 7x = -1$$
$$-2x = -1$$
$$x = \frac{-1}{-2}$$
$$x = 0.5$$
Ответ: x = 0.5
$$-2x + 8 = -x$$
$$-2x + x = -8$$
$$-x = -8$$
$$x = 8$$
Ответ: x = 8
$$3x + 2 = 2x + 5$$
$$3x - 2x = 5 - 2$$
$$x = 3$$
Ответ: x = 3
$$-4x + 6 = -2x + 10$$
$$-4x + 2x = 10 - 6$$
$$-2x = 4$$
$$x = \frac{4}{-2}$$
$$x = -2$$
Ответ: x = -2
$$5x - 1 = 3x + 7$$
$$5x - 3x = 7 + 1$$
$$2x = 8$$
$$x = \frac{8}{2}$$
$$x = 4$$
Ответ: x = 4
$$2x + 4 = 3x - 2$$
$$2x - 3x = -2 - 4$$
$$-x = -6$$
$$x = 6$$
Ответ: x = 6
$$6x - 3 = 4x + 5$$
$$6x - 4x = 5 + 3$$
$$2x = 8$$
$$x = \frac{8}{2}$$
$$x = 4$$
Ответ: x = 4
$$-2x + 1 = -x + 4$$
$$-2x + x = 4 - 1$$
$$-x = 3$$
$$x = -3$$
Ответ: x = -3