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1.8u+10.2=2.7u+12.9=
We move all terms to the left:
1.8u+10.2-(2.7u+12.9)=0
We get rid of parentheses
1.8u-2.7u-12.9+10.2=0
We add all the numbers together, and all the variables
-0.9u-2.7=0
We move all terms containing u to the left, all other terms to the right
-0.9u=2.7
u=2.7/-0.9
u=-3
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