$\frac{5g^{-3}}{4g^{-5}}$
$49+x^2+28x+4$
$\left(2x+a\right)^2$
$\left(-12\right)\:x\:0$
$\int\frac{21x-15}{x^2-x-2}dx$
$\frac{1}{2}a-3\left(\frac{1}{2}a+3\right)$
$2x=36$
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