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7u+13=3u+0
We move all terms to the left:
7u+13-(3u+0)=0
We add all the numbers together, and all the variables
7u-(+3u)+13=0
We get rid of parentheses
7u-3u+13=0
We add all the numbers together, and all the variables
4u+13=0
We move all terms containing u to the left, all other terms to the right
4u=-13
u=-13/4
u=-3+1/4
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