Краткое пояснение: Чтобы решить уравнения, нужно перенести известные значения в одну сторону, а неизвестные в другую, затем выразить x.
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2) x + 5.8 = -4.7
x = -4.7 - 5.8
x = -10.5
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3) 5.5 - x = 12.9
-x = 12.9 - 5.5
-x = 7.4
x = -7.4
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5) x - 9.21 = -4.3
x = -4.3 + 9.21
x = 4.91
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6) x - 4.7 = -2.34
x = -2.34 + 4.7
x = 2.36
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8) x + 12 = 5
x = 5 - 12
x = -7
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9) -5.4 - x = -3.5
-x = -3.5 + 5.4
-x = 1.9
x = -1.9
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11) 2x = 18 - x
2x + x = 18
3x = 18
x = 18 / 3
x = 6
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12) 7x + 3 = 30 - 2x
7x + 2x = 30 - 3
9x = 27
x = 27 / 9
x = 3
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14) 0.2x + 2.7 = 1.4 - 1.1x
0.2x + 1.1x = 1.4 - 2.7
1.3x = -1.3
x = -1.3 / 1.3
x = -1
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16) 11x = 36 - x
11x + x = 36
12x = 36
x = 36 / 12
x = 3
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18) 8 - 4x = 2x - 16
-4x - 2x = -16 - 8
-6x = -24
x = -24 / -6
x = 4
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20) 6.8 - 1.3x = 0.6x - 2.7
-1.3x - 0.6x = -2.7 - 6.8
-1.9x = -9.5
x = -9.5 / -1.9
x = 5
Ответ: x = -10.5; x = -7.4; x = 4.91; x = 2.36; x = -7; x = -1.9; x = 6; x = 3; x = -1; x = 3; x = 4; x = 5