$x^2-4x=5$
$\left(-23\right)-\left(21\right)-\left(-17\right)$
$\left(-25\right)-\left(+25\right)+\left(-5\right)-\left(-11\right)+\left(+7\right)$
$\int\ln\left(x^7\right)dx$
$16^x\:=\:64^{x+4}\:$
$sen^2\left(x\right)-4sen\left(x\right)+4$
$x + 3 = \sqrt { 3 x - 1 }$
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