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