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2014-08-27T15:29:32-03:00
(x-3) (x+5)=
x²+5x-3x-15=
x²+2x-15

(x+3) (x-5)=
x²-5x+3x-15=
x²-2x-15

(x+2) (x+15)=
x²+15x+2x+30=
x²+17x+30



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