$1-25q^4$
$-4a^5\:+\:a^5\:-\:7a^5$
$\frac{dy}{dx}=\frac{e^y}{x^2y}$
$49+2+\left(-2\right)+1$
$5x+3y=12$
$3a\frac{1}{2}b-4-b-\frac{1}{2}a,6$
$4y''-4y'-15y=0$
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