$-3\left(x-7\right)$
$\left(-4\right)-5+\left(3+1\right)-\left(-1\right)$
$x^3\left(x^4+x-81\right)-81$
$\frac{\left(-3-2i\right)}{\left(-5+i\right)}$
$16x^2y+4xy^3-24x^3y^2$
$8+4+5$
$2x+4=-12$
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