$\log\left(2x\right)-\log\left(5\right)=\log\left(4\right)$
$ab+ac^2$
$-x+7,2x+2x-3,5x+4$
$\frac{x^4-5x^2+4}{x^2+1}$
$2x\frac{dy}{dx}=x+3y$
$\frac{3x-5}{4}+\frac{2x+3}{6}>1$
$-x^2+4x+12=0$
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