Ответ:
Пошаговое объяснение:
1)
4 - 7x + 5*(1 - x) = 15*4 -3*(2x + 1)
4 - 7x + 5 - 5x = 60 - 6x - 3
-12x + 9 = 57 - 6x
-12x + 6x = 57 - 9
-6x = 48
x = -48 : 6
x = -8
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2)
10 - y + 2*(3y + 8) = 3*(y + 6)
10 - y + 6y + 16 = 3y + 18
5y + 26 = 3y + 18
5y - 3y = 18 - 26
2y = -8
y = -8 : 2
y = -4
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3)
4*(3x + 5) + 5*(9x - 5) = 20*6 + 10*(3x + 1)
12x + 20 + 45x - 25 = 120 + 30x + 10
57x - 5 = 130 + 30x
57x - 30x = 130 + 5
27x = 135
x = 135 : 27
x = 5
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4)
5 - 9x - 2*(3 + 5x) = 4*(5 - 3x)
5 - 9x - 6 - 10x = 20 - 12x
-19x - 1 = 20 - 12x
-19x + 12x = 20 + 1
-7x = 21
x = -21 : 7
x = -3
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