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75+77+78+84+2x/6=80
We move all terms to the left:
75+77+78+84+2x/6-(80)=0
We add all the numbers together, and all the variables
2x/6+234=0
We multiply all the terms by the denominator
2x+234*6=0
We add all the numbers together, and all the variables
2x+1404=0
We move all terms containing x to the left, all other terms to the right
2x=-1404
x=-1404/2
x=-702
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