$2\ln\left(2x\right)=-4$
$\left(-13\right)\:x\:7\:x\:\left(-2\right)$
$z^2-10z-39$
$\left(c-4d\right)^2$
$7y-4x^2+6y+8y$
$\:\int sen^3\:\left(x\right)\cdot cos^{-3}\:\left(x\right)dx$
$7k-2\ge-9$
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