$2-4n$
$-12-13+4-15$
$\left(m+2n+3f\right)^2$
$\log x+\log\left(x-15\right)=2$
$\frac{x+1}{6x+2}$
$5x+3y,\:x=1,\:y=-1$
$9x^2-12x+12$
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