$-4\:-\:90\:-\:5$
$7x^4\:-\:42\:x^3+63x^2$
$2\left(4x-3\right)=18$
$\frac{x+7}{\sqrt{x}}$
$sin\left(\frac{\pi}{2}+\frac{3}{5}\right)$
$\frac{dx}{dt}=2\left(1-x\right)$
$x^2-3x^2-5x^2$
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