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56=103-u
We move all terms to the left:
56-(103-u)=0
We add all the numbers together, and all the variables
-(-1u+103)+56=0
We get rid of parentheses
1u-103+56=0
We add all the numbers together, and all the variables
u-47=0
We move all terms containing u to the left, all other terms to the right
u=47
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