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-1+5u=7u+3
We move all terms to the left:
-1+5u-(7u+3)=0
We get rid of parentheses
5u-7u-3-1=0
We add all the numbers together, and all the variables
-2u-4=0
We move all terms containing u to the left, all other terms to the right
-2u=4
u=4/-2
u=-2
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