$\frac{3y^2}{2x^{-4}}y^2$
$3+-2-6+5-9-12+-13$
$\frac{1}{2^{45}}+1$
$-3\cdot6-4\cdot5-9\cdot\left(-3\right)$
$a\:2\:+6a+8\:+4a^2+8a+4$
$ax+b=0$
$\frac{4}{s^2+4s+4}$
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