$\frac{\frac{21}{17}+3}{4}+\frac{\frac{21}{17}+6}{3}=2\left(\frac{21}{17}+1\right)$
$\frac{dy}{dt}=10x$
$3ab-5b+8ab-a-6ab+9b$
$5x+4y-2x-3xy+x^2$
$y'\:+2y\:=\:1$
$x2+10x$
$8^2-\left(5-2\right)^2$
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