$-x=25$
$-4-\left(-6-1\right)$
$\int\:\frac{2x}{\sqrt{x^2+4x+3}}dx$
$8b+b$
$\left(6u-3\right)^2$
$-\sin\left(-3x\right)=0$
$\left(6x+5y\right)\left(6x-8y\right)+3\left(7x-2y^2\right)^2$
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