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15=u/2+11
We move all terms to the left:
15-(u/2+11)=0
We get rid of parentheses
-u/2-11+15=0
We multiply all the terms by the denominator
-u-11*2+15*2=0
We add all the numbers together, and all the variables
-1u+8=0
We move all terms containing u to the left, all other terms to the right
-u=-8
u=-8/-1
u=+8
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