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remember order of operaions and distributiv propery a(b+c)=ab+ac 3(x+7)+2x multiply first (distribute) 3(x+7) =3x+21 3x+21+2x 5x+21
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remember order of operaions and distributiv propery a(b+c)=ab+ac 3(x+7)+2x multiply first (distribute) 3(x+7) =3x+21 3x+21+2x 5x+21