$\left(y-7\right)^{-4}\:dx\:+\:e^{-5x}\:dy=0$
$3x^4-4x^2+1$
$2x^2-16x+24>0$
$+3\cdot\left(-4\right)+\left(-3\right)$
$\left(\frac{1}{9}a-a\right)$
$5^{-\frac{x}{100}}=5$
$x^2-3x-270=0$
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