$\int\frac{e^x}{400-e^{2x}}dx$
$3a-6b+3-7a+10$
$-4x^3-23x^2+107x-90$
$1-1+\left(-76+65-\left(-3\right)-4\right)$
$x^2-36=-11$
$x^4-4x^2+3$
$r+\left(-5r\right)$
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