$x-5\cdot x+5$
$\sqrt[4]{x^{-4}}-4x^3-21$
$6+7-9\cdot5$
$2x^2+3y^2\:\cdot\:4x^4-6x^2y^2+9y^4$
$-1099+103-97$
$\left(12b+3\right)\left(12b-3\right)$
$4xy+3x-2y=1$
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