$\left(6x^3-2x^2-3x+1\right)-\left(-x^3-x^2-5x+7\right)$
$3a+5+a+15+2a+10$
$\int\left(\frac{x^2+2x+3}{x+1}\right)dx$
$4-\frac{12}{4}$
$\left(3x^7y^9\right)\left(4xy^5\right)$
$_+81^1 y^2$
$\lim_{x\to\infty}\left(\frac{4x^4+3x^3-2x+10}{x^4+6x^3-3x+12}\right)$
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