$5-2^2-1^3\cdot3$
$64y^2\:-\:48ya\:+\:9a^2$
$\frac{2}{3}x=-12$
$-9\:+\:t\:=\:12$
$x^2-x-18$
$\frac{dy}{dx}=3-\frac{4y}{300-x}$
$x^2+6x+9=25$
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