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9(u+1)=5u+25
We move all terms to the left:
9(u+1)-(5u+25)=0
We multiply parentheses
9u-(5u+25)+9=0
We get rid of parentheses
9u-5u-25+9=0
We add all the numbers together, and all the variables
4u-16=0
We move all terms containing u to the left, all other terms to the right
4u=16
u=16/4
u=4
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