$2-8x^2$
$y'+2y=30$
$-3x^2>-21x+30$
$b^2-25x^2$
$17.5\cdot15.86$
$1.4^2$
$\frac{d^2x}{t^2}\:+\:5x\:=\:3\cos\left(3t\right)$
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