Question

3
$3(x + 2) = 15$
$2(x + 4) = - 4 + 9(x - 1)$
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Answer 1

3(x + 2) = 15

3x + 6 = 15

3x = 15 - 6

3x = 9

x = 9/3

x = 3

2(x + 4) = - 4 + 9(x - 1)

2x + 8 = -4 + 9x - 9

2x - 9x = -4 - 9 - 8

-7x = -21 ×(-1)

7x = 21

x = 21/7

x = 3