$\left(-30\right)-\left(-45\right)$
$2x+y=0\:$
$\left(n^3\right)^3\cdot\left(n^4\right)^5$
$\int\frac{x^2}{\left(x^2+a^2\right)^{1.5}}\:dx$
$x^2-44x+484$
$x^3-x^2y-3xy^2$
$3a+12=126$
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