$30b+15a-17b-8a-13b-7a$
$\frac{dy}{dx}=\frac{4y}{x\left(y-3\right)}$
$10m^5n^2+15m^3n^5$
$7x+8y-42x$
$\lim_{x\to-\infty}\frac{2x^4-4x+1}{3-x^2}$
$\left(-6+3+9-5\right)-\left(-2+7+9-5\right)$
$8\:-\:5\:-\:34\:+\:15\:-\:1$
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