$7-9+3-1+4$
$42\cdot10$
$36v^2-132v+121$
$\left(6x^2+7x+2\right)\left(2x+1\right)$
$y^2-9y+20=0$
$\frac{dy}{dx}+\frac{\left(y^2+1\right)\cos\left(x\right)}{y\sin\left(x\right)}=0$
$\left(4x^2-6x\right)^2$
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