$\left(3x+5x^2\right)^2$
$3x-2\left(20-x\right)=30$
$\frac{3x^3-2x^2-6x-10}{x^2-x-2}$
$x^2-3x<0$
$49x^2-64a^2$
$-91<7\left(-3+x\right)$
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