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(386+2x)/7=80
We move all terms to the left:
(386+2x)/7-(80)=0
We add all the numbers together, and all the variables
(2x+386)/7-80=0
We multiply all the terms by the denominator
(2x+386)-80*7=0
We add all the numbers together, and all the variables
(2x+386)-560=0
We get rid of parentheses
2x+386-560=0
We add all the numbers together, and all the variables
2x-174=0
We move all terms containing x to the left, all other terms to the right
2x=174
x=174/2
x=87
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