$-20\:\left(-12\right)+15$
$-3\left(5x^2-3\right)$
$-3\left(2y-6\right)$
$\left(r+t\right)^2$
$t\frac{11}{t^2}$
$\frac{4+12-x-3}{x-3}$
$\frac{x+7}{4}=\frac{x+4}{7}$
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