$2\pi\left(15\right)$
$19\cdot2+20y+8$
$1-3\left(\infty\right)\cdot\frac{1}{\infty^2}$
$\left(2t^4+9t^2+1\right)^4$
$\frac{15}{8}x^2+\frac{25}{312}x^3$
$-x^3+x^4+8x^3$
$2x-5=-x+19$
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