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22.9-7u=5.4
We move all terms to the left:
22.9-7u-(5.4)=0
We add all the numbers together, and all the variables
-7u+17.5=0
We move all terms containing u to the left, all other terms to the right
-7u=-17.5
u=-17.5/-7
u=2+2.3333333333333/4.6666666666667
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