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(98+x)/2=100
We move all terms to the left:
(98+x)/2-(100)=0
We add all the numbers together, and all the variables
(x+98)/2-100=0
We multiply all the terms by the denominator
(x+98)-100*2=0
We add all the numbers together, and all the variables
(x+98)-200=0
We get rid of parentheses
x+98-200=0
We add all the numbers together, and all the variables
x-102=0
We move all terms containing x to the left, all other terms to the right
x=102
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