7x+5= 5x +7 4x=4+2(3x+5) 4(2x-5)-x = 3x+8 7(3x-2)-6(4x+7) = 18x 2(6x-5)-5(3x+4)=7x-10 9(2x-1)+2 = 2(8x-3) + 2x

ВАРИАНТ 27

1. 7x + 5 = 5x + 7

   7x - 5x = 7 - 5

   2x = 2

   x = 1

2. 4x = 4 + 2(3x + 5)

   4x = 4 + 6x + 10

   4x - 6x = 14

   -2x = 14

   x = -7

3. 4(2x - 5) - x = 3x + 8

   8x - 20 - x = 3x + 8

   7x - 3x = 8 + 20

   4x = 28

   x = 7

4. 7(3x - 2) - 6(4x + 7) = 18x

   21x - 14 - 24x - 42 = 18x

   -3x - 56 = 18x

   -21x = 56

   x = -\(\frac{56}{21}\) = -\(\frac{8}{3}\) = -2 \(\frac{2}{3}\)

5. 2(6x - 5) - 5(3x + 4) = 7x - 10

   12x - 10 - 15x - 20 = 7x - 10

   -3x - 30 = 7x - 10

   -10x = 20

   x = -2

6. 9(2x - 1) + 2 = 2(8x - 3) + 2x

   18x - 9 + 2 = 16x - 6 + 2x

   18x - 7 = 18x - 6

   -7 = -6

   Решений нет