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(20+x)/2=17.70
We move all terms to the left:
(20+x)/2-(17.70)=0
We add all the numbers together, and all the variables
(x+20)/2-(17.7)=0
We add all the numbers together, and all the variables
(x+20)/2-17.7=0
We multiply all the terms by the denominator
(x+20)-(17.7)*2=0
We add all the numbers together, and all the variables
(x+20)-35.4=0
We get rid of parentheses
x+20-35.4=0
We add all the numbers together, and all the variables
x-15.4=0
We move all terms containing x to the left, all other terms to the right
x=15.4
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