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(90+82+78+85+x)/5=85
We simplify the equation to the form, which is simple to understand
(90+82+78+85+x)/5=85
Simplifying terms in parentheses
(+335+1x)/5=85
Reorder the terms in parentheses
(+67 + 0.2x)=85
Remove unnecessary parentheses
+67 + 0.2x=85
We move all terms containing x to the left and all other terms to the right.
+ 0.2x=+85-67
We simplify left and right side of the equation.
+ 0.2x=+18
We divide both sides of the equation by 0.2 to get x.
x=90
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