$\int\left(2xsecx\right)dx$
$5x^2-6x+12$
$3\cdot\left(4-5\right)\cdot2$
$-z-4z$
$\frac{3q^{-4}}{4p^{-2}}$
$-7+4\left(2\left(-2+8\right)\right)$
$-12\left(-12+12\right)+8\left(4-3\right)$
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