$\ln\left(x\right)+4\ln\left(y\right)$
$-\left(\:1y\:+\:6z\:-\:2x\:\right)\:-\:\left(\:-3x\:+\:20y\:\right)\:-\:\left(\:x\:+\:y\:+\:z\:\right)$
$\left(-7\right)\left[\left(-4\right)-6\right]$
$-\frac{1}{4^{-2}}+3$
$\frac{2x+11}{7}=\frac{3}{x}$
$\left(5+4y\right)^2$
$7x-2\:para\:x=1$
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