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x2+19x=-84

 Mar 15, 2016
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x2+19x+84=0

x2+12x+7x+84=0

x(x+12)+7(x+12)=0

(x+12)(x+7)=0

x+12=0  or  x+7=0

x=-12  or  x=-7

 Mar 15, 2016

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