$7ab+4ab-3ab$
$\int\left(\frac{45x^4-8}{9x^5-8x}\right)dx$
$\int9sen\left(\ln\left(5x\right)\right)dx$
$100c^2-400$
$4x^2+8x=-3$
$a^2-3a+1=0$
$\left(\frac{2}{5^{x^2}^y}\right)\:\left(-\frac{2}{3}xy\right)\:\:$
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