$-7ab+4ab-5ab$
$y'=-\frac{\left(cosx\right)y}{senx}$
$cscx-2=0$
$2\left(6^{n+1}\right)-5\left(6^n\right)-6^n$
$\left(8h+3\right)+\left(6h+9\right)$
$\frac{xy^2}{2}\cdot\frac{6x}{y^2}$
$\left(-3\right)-\left(-8\right)+\left(-5\right)-\left(-4\right)-\left(+7\right)$
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