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-1.9=-5.8+u
We move all terms to the left:
-1.9-(-5.8+u)=0
We add all the numbers together, and all the variables
-(u-5.8)-1.9=0
We get rid of parentheses
-u+5.8-1.9=0
We add all the numbers together, and all the variables
-1u+3.9=0
We move all terms containing u to the left, all other terms to the right
-u=-3.9
u=-3.9/-1
u=3+0.9/1
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