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(91.48+82.36+90.72+x)/4=90
We move all terms to the left:
(91.48+82.36+90.72+x)/4-(90)=0
We add all the numbers together, and all the variables
(x+264.56)/4-90=0
We multiply all the terms by the denominator
(x+264.56)-90*4=0
We add all the numbers together, and all the variables
(x+264.56)-360=0
We get rid of parentheses
x+264.56-360=0
We add all the numbers together, and all the variables
x-95.44=0
We move all terms containing x to the left, all other terms to the right
x=95.44
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