$-4\cdot\left(-19\right)\cdot\left(-15\right)$
$-7b\left(4b^2-9a^2-4ab\right)$
$-3\left(-4^a+5^b-6^c\right)$
$\left(-2a+\frac{a}{b}\right)^2$
$5tan\left(x\right)\:-\:11\:=\:5$
$5y^2+8y-4$
$\left(a^2x+a^3-4a^2x^3\right)$
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