$\frac{a}{6}+9\le10$
$-2\:\left(-4\right)\left(-1\right)+7\left(4\right)\left(-2\right)+\left(-1-2\left(6+1-8\right)\right)$
$x2+24x\:+\:144\:=\:0$
$\frac{x^2-4^2}{x-2}$
$\frac{\left(x+1\right)\left(x-1\right)\left(x^2+1\right)+1}{x^4}$
$xy\:'+\:2y\:=\:4x\:^2$
$2^3x\:2^2$
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