$6-12-18+12+16+14-12-14\infty18$
$3x+2y-z=1$
$abc-bc+amn-mn$
$\int\frac{1}{\left(x^2-4x+13\right)}dx$
$\int\frac{x}{sqrt\left(x^2-2\right)}dx$
$7x\:+\:7y\:-\:12x\:+\:9y\:+\:z$
$\int a\left(x\right)^{a-1}dx$
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