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56=4u-16
We move all terms to the left:
56-(4u-16)=0
We get rid of parentheses
-4u+16+56=0
We add all the numbers together, and all the variables
-4u+72=0
We move all terms containing u to the left, all other terms to the right
-4u=-72
u=-72/-4
u=+18
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