$3x+2y-5x-2y$
$\int\left(\frac{3x^2}{16-x^2}\right)dx$
$77\left(\frac{1}{11}z^8-\frac{1}{7}\right)^3$
$\frac{2x-13}{x^2-3x^2}$
$15+3\cdot2$
$\int_2^3\left(x-2\right)e^{2x}\:dx$
$a-b-\left[\frac{a}{2}-\frac{b}{2}\right]+\left(a+b\right)$
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