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65=5u+15
We move all terms to the left:
65-(5u+15)=0
We get rid of parentheses
-5u-15+65=0
We add all the numbers together, and all the variables
-5u+50=0
We move all terms containing u to the left, all other terms to the right
-5u=-50
u=-50/-5
u=+10
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