$2y''+\left(x+1\right)y'+3y$
$\int\left(2-x\right)\left(2^x\right)dx$
$\frac{x^4-5x^2+4}{x+5}$
$\left|-9\right|-\left|-5+7\right|+\left|12\right|$
$\left(x+y+3z\right)^2$
$\left(\frac{x^3+1}{2x^3+1}\right)^4$
$7a^2+2a+6\:para\:a\:=2$
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