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-36=0.9+0.3u
We move all terms to the left:
-36-(0.9+0.3u)=0
We add all the numbers together, and all the variables
-(0.3u+0.9)-36=0
We get rid of parentheses
-0.3u-0.9-36=0
We add all the numbers together, and all the variables
-0.3u-36.9=0
We move all terms containing u to the left, all other terms to the right
-0.3u=36.9
u=36.9/-0.3
u=-123
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