$\left(+2\right)-\left(-3\right)$
$12m^{2}n+24m^{3}n^{2}-36m^{4}n^{3}+48m^{5}n^{4}$
$-12x<-24$
$-\left(12-9\right)\cdot\left(8\cdot18\right)$
$x+15>12x+3$
$7^2+7^2$
$\frac{dx}{dy}=x^2+2x+2$
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