$3a^3b^5-a^5b$
$\left(6x+4y\right)-y$
$a=27^{9^{-4^{-2^{-1}}}}$
$a\left(5x+2y+3z\right)+b\left(3z+2by-5x\right)$
$v^2-18+81$
$\frac{dy}{dx}\left(y=x^4\right)$
$15x\:-\:30y\:$
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