$-7x+2y=18$
$\frac{3}{5}x+\frac{1}{3}x=28$
$\int3u^{-2}dx$
$\frac{2x^2+3x+1}{x-1}$
$x^2+9+49$
$5x\:+\:7\:<\:2x\:+19$
$t\frac{dy}{dt}+\:7y\:=\:t^3$
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