$\left(4x^2\:-\:7xy\right)^2\:$
$y+7=x+27$
$\left(x+3\right)\left(x-3\right)+\left(3x+10y\right)\left(3x-10y\right)$
$x'\:+\:2tx\:=1$
$12x^2-11x+2$
$\left(x-6\right)\left(-2x-1\right)$
$2mn\cdot m^3$
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