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(18+21+17+x)/4=20
We move all terms to the left:
(18+21+17+x)/4-(20)=0
We add all the numbers together, and all the variables
(x+56)/4-20=0
We multiply all the terms by the denominator
(x+56)-20*4=0
We add all the numbers together, and all the variables
(x+56)-80=0
We get rid of parentheses
x+56-80=0
We add all the numbers together, and all the variables
x-24=0
We move all terms containing x to the left, all other terms to the right
x=24
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