Question

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5(a+2)+(a+2) (x-3)-3(x-3) 7(x-7)-3(x-3)

Answer 1

$5(a + 2) + (a + 2) = \\ = 5a + 10 + a + 2 = \\ = 6a + 12 = \\ = 6(a + 2)$
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$(x - 3) - 3(x - 3) = \\ = x - 3 - 3x + 9 = \\ = - 2x + 6 = \\ = 2( - x + 6) = \\ = 2(6 - x)$
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$7(x - 7) - 3(x - 3) = \\ = 7x - 49 - 3x + 9 = \\ = 4x - 40 = \\ = 4(x - 10)$