$\int_{\frac{\pi}{2}}^{\pi}x\sin\left(x\right)dx$
$\left|20\right|+\left|21\right|$
$-6x^2-x^2-x^2$
$t^2-3t-54$
$\frac{y}{e^y}dy=\frac{1}{1+e^x}dx$
$x^2-30x$
$6a-5=7a$
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