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u=56-6u
We move all terms to the left:
u-(56-6u)=0
We add all the numbers together, and all the variables
u-(-6u+56)=0
We get rid of parentheses
u+6u-56=0
We add all the numbers together, and all the variables
7u-56=0
We move all terms containing u to the left, all other terms to the right
7u=56
u=56/7
u=8
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