$\left(-2y\right)+\left(8x+5y\right)$
$\left(n+5\left(n+4\right)\right)$
$1+\frac{1}{\tan^2a}$
$20+2\cdot43$
$32-324-322$
$-12=2+5v+2v$
$4x^2+2x-20=0$
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