$\frac{\left(k^2-7k+10\right)}{\left(k-2\right)}$
$x+\frac{1}{x}=\frac{x^2+1}{x}$
$\left(-3x\:-\:6\right)\:\left(-3x\:-\:4\right)$
$x^2\:y'=2y-2xy$
$\left(7a-5m\right)^2$
$x2\:-\:\:1\:0x\:+\:2$
$12+15+10-3-6-7$
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