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March 26, 2017

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(a-3)(a+7)=-9

  • algebra - ,

    a(a+7)-3(a+7)=-9
    a^2+7a-3a-21+9=0
    a^2+4a-12=0
    a^2+6a-2a-12=0
    a(a+6)-2(a+6)=0
    a+6=0
    a=-6
    OR
    a-2=0
    a=2

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