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(64+69+73+x)/4=70
We move all terms to the left:
(64+69+73+x)/4-(70)=0
We add all the numbers together, and all the variables
(x+206)/4-70=0
We multiply all the terms by the denominator
(x+206)-70*4=0
We add all the numbers together, and all the variables
(x+206)-280=0
We get rid of parentheses
x+206-280=0
We add all the numbers together, and all the variables
x-74=0
We move all terms containing x to the left, all other terms to the right
x=74
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