Question

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Answer 1

Пошаговое объяснение:

$5(x - 4) = x + 8 \\ 5x - 20 = x + 8 \\ 5x - x = 28 \\ 4x = 28 \\ x = 7$

$9 - 7(x + 3) = 5 - 6x \\ 9 - 7x - 21 = 5 - 6x \\ - 7x + 6x = 5 + 21 - 9 \\ - x = 17 \\ x = - 17$

$(7x + 9) - (11x - 7) = 8 \\ 7x - 11x + 9 + 7 = 8 \\ - 4x = - 8 \\ x = 2$

Answer 2

1)5(X-4)=X+8
5x-20=x+8
5x-x-20=8
4x-20=8
4x=28
x=28:4
x=7
2)9-7(x+3)=5-6x
9-7x-21=5-6x
-12-7x=5-6x
-12-7x+6x=5
-7x+6x=5+12
-x=5+12
-x=17
x=-17
3)(7x+9)-(11x-7)=8
7x+9-11x+7=8
-4x+16=8
-4x=-8
x=2