$-3\left(1-8\right)+2^3$
$3\cdot\left(x^2-3x\right)+5x$
$1-2\:\cos^2x=\sin x\:\cos x\left(\tan x-\cot x\right)$
$x^2-48x+100$
$\left(+10\right)-\left(+9\right)+\left(-8\right)-\left(-7\right)$
$10-\left(-8-\left(15-13\right)\right)$
$x^2+13x-36$
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