$-7x\:=70$
$250x^2-40$
$2\log_a\left(x\right)-\log_a\left(y\right)$
$\int\left(x^{-2}-4\right)\left(x^{-1}+1\right)^2dx$
$\left(21x\right)\left(3xy\right)$
$\lim_{t\to\infty}\left(\frac{ln\left(x\right)}{x^2}\right)$
$\frac{\sin30}{\cos30}+5x\tan30$
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