1) 7(х +3 ) = 2(х+6) 2) 4(2-х )= 6х+28
3) 8(2х – 1) – 5(3х + 0,8) = х-4
4) 8х + 40 = 100 + 2х
5) 3,5 – 3х = 2,3 + х
123
125
Ответы на вопрос:
1) 7x + 21 = 2x + 12
7x - 2x = 12 - 21
5x = -9
x = -(9 + 5)
x = -14
2) 8 - 4x = 6x + 28
8 - 28 = 4x + 6x
-20 = 10x
x = -20 ÷ 10
x = -2
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