$-8+x=221$
$4-x\leq 7+3x$
$3d+30+9d$
$\sin\left(2x+b\right)$
$\frac{sinx}{cotx}$
$\frac{\left(c^6\right)^3}{c^x}=c^{-5}\cdot c^2$
$\left(15x+1\right)\left(15x-20\right)$
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