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3.7=6.8+u
We move all terms to the left:
3.7-(6.8+u)=0
We add all the numbers together, and all the variables
-(u+6.8)+3.7=0
We get rid of parentheses
-u-6.8+3.7=0
We add all the numbers together, and all the variables
-1u-3.1=0
We move all terms containing u to the left, all other terms to the right
-u=3.1
u=3.1/-1
u=-3+0.1/1
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