$-12x-17=-89$
$\int_{\pi}^{2\pi}cos2xdx$
$\frac{a^4-a^2-1}{a^2+1}$
$-4x+30=-3x-10$
$y'=\frac{x-y}{x+y}$
$8xe^{4x}-2e^{4x}$
$\left(8x^3+7\right)\left(8x^3-9\right)$
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