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12u=45+7u
We move all terms to the left:
12u-(45+7u)=0
We add all the numbers together, and all the variables
12u-(7u+45)=0
We get rid of parentheses
12u-7u-45=0
We add all the numbers together, and all the variables
5u-45=0
We move all terms containing u to the left, all other terms to the right
5u=45
u=45/5
u=9
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