$\lim_{x\to2}\frac{2x^2+3x-2}{x+2}$
$-y^2=x-3$
$x^2-2x=99$
$x^2+4x-20=0$
$-7\cdot32$
$\left(3a^3+b^3\right)^2$
$s^2+3s=-4$
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