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7=u/4
We move all terms to the left:
7-(u/4)=0
We add all the numbers together, and all the variables
-(+u/4)+7=0
We get rid of parentheses
-u/4+7=0
We multiply all the terms by the denominator
-u+7*4=0
We add all the numbers together, and all the variables
-1u+28=0
We move all terms containing u to the left, all other terms to the right
-u=-28
u=-28/-1
u=+28
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