$7x\left(5-y\right)-3\left(9x+2\right)-4xy$
$5-8x>-3$
$6\left(x+5\right)-5x=-25$
$\frac{64x^6-1}{2x+1}$
$x^4-20x^2-28x+15$
$5-3+4-1+2$
$\left(25mn^2+13m^2n+2n\right)+\left(-24m^2\:n\:-\:61mn^2\:-3n\right)\:$
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