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3u+37=7u-43
We move all terms to the left:
3u+37-(7u-43)=0
We get rid of parentheses
3u-7u+43+37=0
We add all the numbers together, and all the variables
-4u+80=0
We move all terms containing u to the left, all other terms to the right
-4u=-80
u=-80/-4
u=+20
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