$7x^2+6x-1$
$1+2y=7$
$\int x^4df$
$\left(\sqrt{7}\right)^2$
$\lim_{x\to\frac{1}{2}}\left(4x\right)$
$x^2\:-\:20x\:+\:x^2\:+\:3x\:$
$y^{'\:}+xy=x^3y^3$
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