$a\frac{k}{2}$
$y\cdot\frac{dy}{dx}+3x^2=7$
$x^2+16\:x\:x+y$
$x^4-29x^2+140$
$7+\left(16-4^2\right)-8$
$5x^2+11x+10$
$-24.37+5.305$
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