$7x\:+\:7y\:-\:7x\:+\:8y\:+12$
$\left(a\:-\:3b\:-\:4c\right)^2$
$\int\left(cos^{-1}\left(\frac{x}{2}\right)\right)dx$
$2\cdot4+4$
$\left(3x^2-2z\right)\left(3x^2+2z\right)$
$-17-\left(-21\right)$
$\int4e^{-5x}+\frac{5}{x}dx$
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