$-x+15\le\:3-7x$
$2+9:3+5+3x\left(-4\right)$
$cosx\left(cosx-tanxsinx\right)=1$
$3\left(x+4\right)=2\left(x-1\right)$
$\int_{-1}^1\frac{4x}{-x^2+4}dx$
$3y-y+8y$
$\int\frac{x}{x^2-2x-24}dx$
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