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-8.2=4.6+u/8
We move all terms to the left:
-8.2-(4.6+u/8)=0
We add all the numbers together, and all the variables
-(u/8+4.6)-8.2=0
We get rid of parentheses
-u/8-4.6-8.2=0
We multiply all the terms by the denominator
-u-(4.6)*8-(8.2)*8=0
We add all the numbers together, and all the variables
-1u-102.4=0
We move all terms containing u to the left, all other terms to the right
-u=102.4
u=102.4/-1
u=-102+0.40000000000001/1
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