$-18=\frac{5}{2}r+12$
$\ln\left(x^6\right)$
$7.42\:x\:6.2$
$\sin x\sec x=1$
$\lim_{x\to-4}\left(\frac{x^2-8x+15}{x+4}\right)$
$-10z+4=8x+20$
$\int_1^3\left(x^2y\right)dy$
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