$\left(-2x^2y^4\right)\left(+5x^3y^b\right)$
$2^3-6$
$x+5=2x-80$
$\frac{-40}{-40}$
$\left(a\:-\:b\right)\:.\:c\:\:$
$2\tan\left(a\right)=2\sin\left(a\right)\cos\left(a\right)$
$\frac{a^2+b^2}{b}-a$
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