$-6\left(1+7k\right)+7\left(1+6k\right)\le-2$
$\left(6f-8m\right)^2$
$-2x+8=18$
$\left(m-n\right)^3$
$20+30+68-15-70-10+30$
$\frac{1-3i}{2+2i}$
$\left(-3\right)^3+\left(4\right)^2+24$
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