$400-1600+3000$
$\left(5y^{a-1}+4\right)\left(5y^{a+1}-14\right)$
$-3x^2ym+7x-ymx^2+16x$
$\frac{dy}{dx}=-2y+4e^x$
$-2\left(x+3\right)-3x+7\left(x-4\right)+x$
$\left(3x^2-2x+4\right)-\left(x^2-x+1\right)$
$\frac{12-6csc^2x}{csc^2x}$
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