$8am-20bm-6an+15bn$
$2\cdot\frac{1}{2}+6\left(9+16\right)-4\cdot25$
$a\left(-2+\left(a-1\right)^2\right)+1$
$40.5+16.5+30$
$\frac{24}{3}$
$\left(x+3\right)^2+\left(x+5\right)^2-2\left(x-6\right)\left(x+4\right)$
$0.85714285714\:\cdot6$
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