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(47+42+94+39+39+72+92+x)/6=80
We simplify the equation to the form, which is simple to understand
(47+42+94+39+39+72+92+x)/6=80
Reorder the terms in parentheses
(+70.833333333333 + 0.16666666666667x)=80
Remove unnecessary parentheses
+70.833333333333 + 0.16666666666667x=80
We move all terms containing x to the left and all other terms to the right.
+ 0.16666666666667x=+80-70.833333333333
We simplify left and right side of the equation.
+ 0.16666666666667x=+9.166666666667
We divide both sides of the equation by 0.16666666666667 to get x.
x=55.000000000002
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