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0.24-0.27u=0.1239
We move all terms to the left:
0.24-0.27u-(0.1239)=0
We add all the numbers together, and all the variables
-0.27u+0.1161=0
We move all terms containing u to the left, all other terms to the right
-0.27u=-0.1161
u=-0.1161/-0.27
u=0.1161/0.27
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