$\:-6x\:+\:3;\:x=\:-2$
$-15x\:+\:8y\:+\:5x\:-\:9y$
$2x^{2}-5x+7y-9=0$
$5-\left(-10.8\right)$
$\frac{x^4+18x^2+81}{x-1}$
$\frac{dy}{dx}=\frac{-2x+3y}{x}$
$\lim_{x\to\frac{\pi}{2}}\left(6tanx^{6cosx}\right)$
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