$-3mn^2-7m^2n+5-6mn^2+8m^2n-12$
$\left(d+6\right)^2$
$x^5+3x^2-2x$
$15-3x<4+2x$
$5y^7\cdot4y^6$
$\left(x+3\right)\left(x-3\right)+\left(x+2\right)\left(x-2\right)$
$3x\:+5y=7$
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