Question

(3x+1)(3x-1)-(3x-1)
$(3x + 1)(3x - 1) - (3x - 1)$
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Answer 1

(3x+1)(3x-1)-(3x-1)

(3x+1)(3x+1-1)

(3x-1)3x

$3x(3x - 1)$

espero ter ajudado, melhor resposta poe favor