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55=4u+15
We move all terms to the left:
55-(4u+15)=0
We get rid of parentheses
-4u-15+55=0
We add all the numbers together, and all the variables
-4u+40=0
We move all terms containing u to the left, all other terms to the right
-4u=-40
u=-40/-4
u=+10
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