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6u+15=11+5u
We move all terms to the left:
6u+15-(11+5u)=0
We add all the numbers together, and all the variables
6u-(5u+11)+15=0
We get rid of parentheses
6u-5u-11+15=0
We add all the numbers together, and all the variables
u+4=0
We move all terms containing u to the left, all other terms to the right
u=-4
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