$3\ln\left(x\right)+\frac{1}{2}\ln\left(x+6\right)-2\ln\left(x+6\right)$
$\frac{x^2-2x+1}{x^2-2x+3}$
$\frac{4x^2}{2y}-\frac{6x^3}{y^4}$
$-3x^3-18x^6$
$1500\cdot\frac{5}{3}$
$\left(z+5\right)\left(2z+7\right)$
$7x\ge x+30$
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