$a+2a+3a-6a$
$16a+3b-13b-11a+4b$
$\left(\frac{mn}{2}+\frac{2}{5}\:m^2\right)^2$
$8\left(4x-3\right)-16x\le4\left(2+4x\right)-23$
$\frac{\sin\left(-3x\right)}{\sin\left(2x\right)}$
$-5t\:+\:10\:=25$
$f\left(x\right)=\frac{\left(x-4\right)}{\left(\sqrt{x}-2\right)}$
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