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-19.8=u/7-2.3
We move all terms to the left:
-19.8-(u/7-2.3)=0
We get rid of parentheses
-u/7+2.3-19.8=0
We multiply all the terms by the denominator
-u+(2.3)*7-(19.8)*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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