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12u=54+6u
We move all terms to the left:
12u-(54+6u)=0
We add all the numbers together, and all the variables
12u-(6u+54)=0
We get rid of parentheses
12u-6u-54=0
We add all the numbers together, and all the variables
6u-54=0
We move all terms containing u to the left, all other terms to the right
6u=54
u=54/6
u=9
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