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Explications étape par étape

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45 - 12x = 75 - 27x

27x - 12x = 75 - 45

15x = 30

x = 30/15

x = 2

4x + 15 = -12x - 1

4x + 12x = -15 - 1

16x = -16

x = -16/16

x = -1

-25 - 7x = 3x + 30

-25 - 30 = 3x + 7x

-55 = 10x

x = -55/10

x = -5,5