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(88.4+x)/2=90
We move all terms to the left:
(88.4+x)/2-(90)=0
We add all the numbers together, and all the variables
(x+88.4)/2-90=0
We multiply all the terms by the denominator
(x+88.4)-90*2=0
We add all the numbers together, and all the variables
(x+88.4)-180=0
We get rid of parentheses
x+88.4-180=0
We add all the numbers together, and all the variables
x-91.6=0
We move all terms containing x to the left, all other terms to the right
x=91.6
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