$\left(x+1\right)\frac{dz}{dx}+xz$
$x^2-30x+225=441$
$63-\left(-80\right)$
$\frac{5x^3-4x^2-x}{x-1}$
$cos\:2x\:-\:3\:sen\:x\:+\:1\:=\:0$
$\int_2^6\left(\frac{x}{\sqrt{5x^2+1}}\right)dx$
$w^3\cdot w^{-9}$
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