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-6.1=5.1+u/7
We move all terms to the left:
-6.1-(5.1+u/7)=0
We add all the numbers together, and all the variables
-(u/7+5.1)-6.1=0
We get rid of parentheses
-u/7-5.1-6.1=0
We multiply all the terms by the denominator
-u-(5.1)*7-(6.1)*7=0
We add all the numbers together, and all the variables
-1u-78.4=0
We move all terms containing u to the left, all other terms to the right
-u=78.4
u=78.4/-1
u=-78+0.40000000000001/1
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