$x^2-6x+4=0$
$4\cdot\left(-9\right)\cdot\left(-3\right)\cdot\left(-1\right)$
$-\left|15\right|-\left|-7\right|$
$-4\left(-3t+1\right)-7t=5t-4$
$\frac{48x^22-74xy+28y^2}{8x-7}$
$\frac{18}{\frac{2}{2}}$
$3x^2-2xy^2$
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