$\left(11+\frac{1}{y}\right)\left(-11+\frac{1}{y}\right)$
$7\cdot\left(5+30s-45t\right)$
$4\cdot2-1^2$
$^{-3^2}$
$a\:=\:-11\:+\:\frac{10y}{x}-\frac{by}{x\:}$
$\left(2ab+b\right)\left(2a+b\right)$
$\sqrt[3]{x^5y}$
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