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15u+1=18+5u+9u
We move all terms to the left:
15u+1-(18+5u+9u)=0
We add all the numbers together, and all the variables
15u-(14u+18)+1=0
We get rid of parentheses
15u-14u-18+1=0
We add all the numbers together, and all the variables
u-17=0
We move all terms containing u to the left, all other terms to the right
u=17
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