$\frac{3x+5}{\left(x+1\right)^{2}\left(x^{2}+1\right)}$
$4x^3-16x$
$4\left(-1^2\right)\left(-2\right)-3\left(-1^4\right)\left(-2\right)\left(2\right)$
$3y=18$
$x-12=4x+3$
$xy-3y$
$-4b^2-13b^2$
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