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Anonymous
7x + 7 = 7(x + 1)
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(x - y + 7)(x + y)
(3b + 7x)(3b + 7x) or (3b + 7x)2
-2x+7x=5x. Factor out the x. -2+7 I hope you know how to use a calculator. :D
7 x3 + 2 x = x (7 x2 + 2)
In 7x+7, x is a variable.