$\int\frac{7}{x^2+7}dx$
$3x+2y-5x+4y$
$-20\:x-18$
$6a+2a-5a$
$9a^2b^2+4x^2+12abx$
$-9x^2-4x$
$\frac{dy}{du}+0.25y=0.5e^{-0.5u}$
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