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(17+17+14.5+13+20+x)/6=12.55
We move all terms to the left:
(17+17+14.5+13+20+x)/6-(12.55)=0
We add all the numbers together, and all the variables
(x+81.5)/6-(12.55)=0
We add all the numbers together, and all the variables
(x+81.5)/6-12.55=0
We multiply all the terms by the denominator
(x+81.5)-(12.55)*6=0
We add all the numbers together, and all the variables
(x+81.5)-75.3=0
We get rid of parentheses
x+81.5-75.3=0
We add all the numbers together, and all the variables
x+6.2=0
We move all terms containing x to the left, all other terms to the right
x=-6.2
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