$x\cdot x\:+4x-8$
$1+a^31$
$\left(3ab-\frac{1}{2}c\right)^2$
$a\:=\:-11\:+\:\frac{10y}{x}-\frac{by}{x\:}$
$81x^2-216x+144$
$2-3x\ge0$
$5x\left(4x+y\right)$
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