$12-4\cdot\left(\frac{15}{5}-5\right)^2-\left(12-5\cdot4\right)$
$x-\frac{1}{x}=x+\frac{1}{x}$
$\left(xy-1\right)\left(x^2y^2+xy+1\right)$
$\tan\left(x\right)^2+1=\frac{11}{9}$
$h\left(x\right)=\left(lnx-3\right)^5$
$log7\:x=-2$
$2+5\left(x+3\right)-\:\left(2x-7\right)\left(x+2\right)$
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