Ответ:

Пошаговое объяснение:

3x - 1 = x - 3

3x - x = -3+1

2x = -2

x = -2 : 2

x = -1

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-6x + 12 = -4x + 8

6x - 4x = 12 - 8

2x = 4

x = 4:2

x = 2

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5y - 8 = 2y - 5

5y - 2y = 8 - 5

3y = 3

y = 3:3

y = 1

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(2/3)x = 18

x = 18 * 3/2

x = 27

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11 + x = 1 - 4x

x + 4x = 1 - 11

5x = -10

x = -10:5

x = -2

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0,4x = -12

x = -12:0,4

x = -30

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x + 20 = 5 + 4x

4x - x = 20 - 5

3x = 15

x = 15 : 3

x = 5