$\left(a+2b\right).c-ca-4bc$
$a+b-c-b-b+2c-a$
$\frac{dx}{dt}=xsec^2\left(t\right)$
$\frac{1}{x}<5$
$10x^2\:+60x+250$
$b^2-7b-60$
$\int\frac{-\frac{2}{49}x+1}{x^2+49}dx$
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