$\frac{2mn}{5}\left(\frac{3x}{7}-1\right)$
$-7-\left(5+2-\left(1\right)+10\right)$
$-19ab+5ab-7ab-13ab+14ab-80ab$
$2+-21+1$
$xy'\:+\:3y\:=\:3x^2+4$
$4x\:8x\:-16xy$
$7a\left(2a+b\right)+8b\left(2a+b\right)-4a\left(2a+b\right)$
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