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(85+91+89+94+x)/5=90
We simplify the equation to the form, which is simple to understand
(85+91+89+94+x)/5=90
Simplifying terms in parentheses
(+359+1x)/5=90
Reorder the terms in parentheses
(+71.8 + 0.2x)=90
Remove unnecessary parentheses
+71.8 + 0.2x=90
We move all terms containing x to the left and all other terms to the right.
+ 0.2x=+90-71.8
We simplify left and right side of the equation.
+ 0.2x=+18.2
We divide both sides of the equation by 0.2 to get x.
x=91
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