$\left(13\right)-\left(-3\right)$
$-7b+7b$
$\frac{b+9}{-6}=-16$
$\frac{dy}{dx}\left(\frac{\left(4x-5\right)^3}{x^2-1}\right)$
$\left(0.205+1.72x+0.851y\right)+\left(-0.509+0.953x-1.72y\right)$
$123.67\cdot89$
$\cot\left(x\right)\frac{dy}{dx}+y=\cos\left(x\right)$
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