3x - 21 - 2x - 2 = - 18
x - 23 = - 18
x = 18 + 23
x = 5
Ответ: 5 .
(2x + 6)(7 - 4x) = (2 - x)(8x + 1) + 15
14x - 8 + 42 - 24 x = 16x + 2 - 8 - x + 15
14x + 42 - 24 x = 16x + 2 - x + 15
-10x + 42 = 15x + 17
-10x - 15x = 17 - 42
- 25 x = -25
x = 1
Ответ: 1 .
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3x - 21 - 2x - 2 = - 18
x - 23 = - 18
x = 18 + 23
x = 5
Ответ: 5 .
(2x + 6)(7 - 4x) = (2 - x)(8x + 1) + 15
14x - 8
+ 42 - 24 x = 16x + 2 - 8
- x + 15
14x + 42 - 24 x = 16x + 2 - x + 15
-10x + 42 = 15x + 17
-10x - 15x = 17 - 42
- 25 x = -25
x = 1
Ответ: 1 .