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11.38=u-4.2
We move all terms to the left:
11.38-(u-4.2)=0
We get rid of parentheses
-u+4.2+11.38=0
We add all the numbers together, and all the variables
-1u+15.58=0
We move all terms containing u to the left, all other terms to the right
-u=-15.58
u=-15.58/-1
u=15+0.58/1
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