$\:-3\cdot5+7-3\cdot4-10\cdot2$
$\left(xy^2+\frac{5}{4}a\right)^2$
$\lim_{x\to-\infty}\left(e^{2x}-e^x\right)$
$13x^2y^2+65x^3y$
$25=25+5x$
$12x-7<18x-9$
$\int\frac{2x+1}{\left(x-9\right)}dx$
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