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-2.3=u/7+15.2
We move all terms to the left:
-2.3-(u/7+15.2)=0
We get rid of parentheses
-u/7-15.2-2.3=0
We multiply all the terms by the denominator
-u-(15.2)*7-(2.3)*7=0
We add all the numbers together, and all the variables
-1u-122.5=0
We move all terms containing u to the left, all other terms to the right
-u=122.5
u=122.5/-1
u=-122+0.5/1
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