$a+3b;\:a\:=\:9;\:b=2$
$24x-12ab$
$xy=36$
$\int x\left(x^2+2x\right)\cdot\cos\left(x\right)dx$
$\int\frac{\left(4x-7\right)}{\left(x^2-2x+1\right)}dx$
$-2b\:=\:-10$
$18a^3b^2\:-12^5b^3+48a^2b^4$
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