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90=(86+93+n)/3
We simplify the equation to the form, which is simple to understand
90=(86+93+n)/3
Simplifying terms in parentheses
90=(+179+1n)/3
Reorder the terms in parentheses
90=(+59.6666666667 + 0.333333333333n)
Remove unnecessary parentheses
90=+59.6666666667 + 0.333333333333n
We move all terms containing n to the left and all other terms to the right.
-0.333333333333n=+59.6666666667-90
We simplify left and right side of the equation.
-0.333333333333n=-30.3333333333
We divide both sides of the equation by -00.333333333333 to get n.
n=91.0000000001
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