Question

013):
3) 3(3x + 5) - 4(3x - 5) = 0;
4) 7(5 - x) + 2 = 5(6 -x)+1
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Answer 1

1) 3 ( 3х + 5 ) - 4 ( 3х - 5 ) = 0

9х + 15 - 12х + 20 = 0

9х - 12х = -15 - 20

-3х = -35

х = 35/3 = 11 ⅔.

Ответ : х = 11 ⅔.

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2) 7 ( 5 - х ) + 2 = 5 ( 6 - х ) + 1

35 - 7х + 2 = 30 - 5х + 1

-7х + 5х = 30 + 1 - 35 - 2

-2х = -6

х = (-6) ÷ (-2)

х = 3.

Ответ : х = 3.

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Удачи)))

Answer 2

$3( 3x + 5) - 4(3x - 5) = 0 \\ \\ 9x + 15 - 12x + 20 = 0 \\ \\ - 3x = - 35 \\ \\ x = - 35 \div ( - 3) \\ \\ x = 11 \frac{2}{3} \\ \\ \\ 7(5 - x) + 2 = 5(6 - x) + 1 \\ \\ 35 - 7x + 2 = 30 - 5x + 1 \\ \\ - 7x + 5x = 30 + 1 - 35 - 2 \\ \\ - 2x = - 6 \\ \\ x = - 6 \div ( - 2) \\ \\ x = 3$

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