$x^2-121=0$
$\int4x^{-1}dx$
$\frac{n}{3^n}\cdot\left(x+3\right)^n$
$( 3 x + 6 ) ( 2 x + 4 )$
$\int\pi x\:dx$
$20x^5-15x^4+30-5x$
$\log\left(x\right)=\log\left(0.02\right)$
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