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-13.4=-2.2+u/7
We move all terms to the left:
-13.4-(-2.2+u/7)=0
We add all the numbers together, and all the variables
-(u/7-2.2)-13.4=0
We get rid of parentheses
-u/7+2.2-13.4=0
We multiply all the terms by the denominator
-u+(2.2)*7-(13.4)*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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