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(90+82+81+2x)/4=86
We simplify the equation to the form, which is simple to understand
(90+82+81+2x)/4=86
Reorder the terms in parentheses
(+63.25 + 0.5x)=86
Remove unnecessary parentheses
+63.25 + 0.5x=86
We move all terms containing x to the left and all other terms to the right.
+ 0.5x=+86-63.25
We simplify left and right side of the equation.
+ 0.5x=+22.75
We divide both sides of the equation by 0.5 to get x.
x=45.5
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