(x+5)(x-3)
x*x+x*(-3)+5*x+5*(-3)
x²-3x+5x-15
x²+2x-15
(3x-7)(2+x)
3x*2+3x*x-7*2-7*x
6x+3x²-14-7x
3x²-x-14
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(x+5)(x-3)
x*x+x*(-3)+5*x+5*(-3)
x²-3x+5x-15
x²+2x-15
(3x-7)(2+x)
3x*2+3x*x-7*2-7*x
6x+3x²-14-7x
3x²-x-14