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(80+80+x)/3=70
We simplify the equation to the form, which is simple to understand
(80+80+x)/3=70
Reorder the terms in parentheses
(+53.333333333333 + 0.33333333333333x)=70
Remove unnecessary parentheses
+53.333333333333 + 0.33333333333333x=70
We move all terms containing x to the left and all other terms to the right.
+ 0.33333333333333x=+70-53.333333333333
We simplify left and right side of the equation.
+ 0.33333333333333x=+16.666666666667
We divide both sides of the equation by 0.33333333333333 to get x.
x=50.000000000001
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