$x=4x+15$
$-x^2-7x-30$
$5\left(a+b\right)^4$
$10=5+t$
$\frac{3\left(\infty\right)^2+2\left(\infty\right)-1}{4\left(\infty\right)^2+6}$
$\frac{d}{dx}2x^3-24x$
$6a=78$
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