Ответ:

Пошаговое объяснение:

7x = -30 + 2x

7x - 2x = -30

5x = -30

x = -30 : 5

x = -6

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16 - 18x = -25x - 12

25x - 18x = -12 - 16

7x = -28

x = -28 : 7

x = -4

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-17x + 20 = 7x - 28

7x + 17x = 20 + 28

24x = 48

x = 48 : 24

x = 2

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2x + 49 = 4x - 65

4x - 2x = 49 + 65

2x = 114

x = 114:2

x = 57

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6x + 100 = 9x + 1

9x - 6x = 100 - 1

3x = 99

x = 99 : 3

x = 33

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5x - 18 = -12x + 17

5x + 12x = 17 + 18

17x = 35

x = 35 : 17

x = 1цел. 1/17