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50=5+5u
We move all terms to the left:
50-(5+5u)=0
We add all the numbers together, and all the variables
-(5u+5)+50=0
We get rid of parentheses
-5u-5+50=0
We add all the numbers together, and all the variables
-5u+45=0
We move all terms containing u to the left, all other terms to the right
-5u=-45
u=-45/-5
u=+9
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