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-12.15+11.5u=19.6u
We move all terms to the left:
-12.15+11.5u-(19.6u)=0
We add all the numbers together, and all the variables
11.5u-(+19.6u)-12.15=0
We get rid of parentheses
11.5u-19.6u-12.15=0
We add all the numbers together, and all the variables
-8.1u-12.15=0
We move all terms containing u to the left, all other terms to the right
-8.1u=12.15
u=12.15/-8.1
u=-1+1/2
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