$\frac{dy}{dx}=\frac{\sin\left(7x\right)}{-2y\cos^3\left(7x\right)}$
$6x+18=x+93$
$ln\infty$
$3y\:+4+4y+3+5y+8$
$-72\:-\:\left(-12\right)$
$x^2+20x>2400$
$3x^2x-5x+4$
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