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28=-2+5u
We move all terms to the left:
28-(-2+5u)=0
We add all the numbers together, and all the variables
-(5u-2)+28=0
We get rid of parentheses
-5u+2+28=0
We add all the numbers together, and all the variables
-5u+30=0
We move all terms containing u to the left, all other terms to the right
-5u=-30
u=-30/-5
u=+6
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