$x-1<3x+7$
$\left(3y+x\right)\left(3y-x\right)$
$200-2x+3x-170+x-35$
$\frac{x^2-15x+25}{x+5}$
$7\left(3a-1\right)^2+26\left(3a-1\right)-8$
$u^2-u=\:\frac{1}{x}$
$\:\:y=\sqrt{\frac{4}{x-2}}$
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