$-12-4b=4-2b$
$18xy^836xy^6.90xy^4$
$x^{2+21-10=0}$
$\left(5\right)\left(mx+7m\right)$
$\cos^2\left(116.4\right)$
$\left(6d\:\:-\:\:15\:\right)\left(6d+8\right)-\left(12-3\right)^2+5\left(3d-10\right)$
$\left(x^5y-mn^3\right)^2$
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