$\left(\frac{x-1}{x+3}\right)=\left(\frac{5x+20}{x^2-16}\right)$
$\left(5m+4n\right)\left(7n-3m\right)$
$x^2-7x-30<0$
$25a-70a+49$
$4\left(x+6\right)-5<35$
$\left(5x^2-2x^2-3\right)$
$g^4b\left(12gb^2-8g^2b^3+9g^3b^4\right)$
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