$-24x+12$
$18\cdot18$
$7\cdot\left(-5-6\right)$
$x^2-\frac{3}{4}x=5$
$\lim_{x\to3}\left(\frac{\tan\left(-4-2x\right)-3x^2}{3x+6}\right)$
$45\cdot46$
$2x^4-1x^2y+3y^2-2x^4-5+2y^2$
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