$36y^2-81n^2$
$y'=y-6$
$\int\frac{\left(x^2-x-6\right)}{\left(x+2\right)}dx$
$5x-3\le2x+15$
$2x^4z+5x^2$
$x^2-x=5$
$\frac{5y}{y}$
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