$\frac{3xy^9}{2y^{-2}}.\frac{-7y}{42x^5}$
$a=\frac{x+3}{2}-\frac{2}{x}$
$y'=\left[x^4\:\left(-3\right)\right]+\left[\left(9-3x\right)\right]4x^3$
$\left(\:-\:5\:\right)\:^2\:+\:\left(\:-\:1\:\right)\:^3$
$|-6\:+\:-12|$
$4.8\cdot2^3$
$22-\left(-5\right)$
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