$+20\:+30\:+50\:-10$
$\int\frac{2x+3}{x^3+x^2+x}dx$
$\frac{d}{dx}-2x^4-x^3+7x$
$\left(x+1\right)\left(x-3\right)=77$
$\int\frac{\sin\left(x\right)}{\left(3+\cos\left(x\right)\right)^2}dx$
$1-a^4$
$3m+m^3+-4m^2+5+-x^3+4x^2-6$
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