$-15+4+1$
$\frac{2}{5}\left(7x-1\right)=3x-1$
$628+242$
$-11y^2+-9y^2$
$y'=3x+5$
$\left(m+n+w\right)-\left(2m-3n-4w\right)$
$5x^2=6x+x^3$
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