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Ответ:

Пошаговое объяснение:

56x - 26x + 168 = 720

30х+168=720

30х=720-168

30х=552

x=92/5 = 18 2/5

27a - 13 + 3a = 167

30a-13=167

30a=167+13

30a=180

a=6

12x + 55 = x

12x-x=-55

11x=-55

x=-5

12 - x = 5x + 8

-x-5x=8-12

-6x=-4

x=2/3

3x + 7 = 3 - x

3x+x=3-7

4x=-4

x=-1

5a + 3 = -15 - a

5a+a=-15-3

6a=-18

a=-3

10x -178 = 5 - 178

10x=5

x=1/2

37x - 8 = 42 + 12x

37x-12x=42+8

25x=50

x=2

-69 - (c -78) = -1

-69-с+78=-1

9-с=-1

-с=-1-9

-с=-10

с=10

-67 - (a - 76) = -2

-67-а+76=-2

9-а=-2

-а=-2-9

-а=-11

а=11

(7x +9) - (11x - 7) = 8

7х+9-11х+7=8

-4х+16=8

-4х=8-16

-4х=-8

х=2