(75+99+87+89+91+x)/6=90

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Solution for (75+99+87+89+91+x)/6=90 equation: 



(75+99+87+89+91+x)/6=90

We move all terms to the left:

(75+99+87+89+91+x)/6-(90)=0

We add all the numbers together, and all the variables

(x+441)/6-90=0

We multiply all the terms by the denominator


(x+441)-90*6=0

We add all the numbers together, and all the variables

(x+441)-540=0

We get rid of parentheses

x+441-540=0

We add all the numbers together, and all the variables

x-99=0

We move all terms containing x to the left, all other terms to the right

x=99

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