$2\left(1+3u\right)-\left(1-4u\right)$
$5b=5$
$\frac{2s-3}{7}=5$
$45n^2+80n+120=20n^2-20n+20$
$\left(+4\right)-\left(-8\right):2-\left(-9+13\right)$
$4n\:4n$
$\sqrt{3x^2-5x+2}=0$
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