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6x-81=4x-7
We move all terms to the left:
6x-81-(4x-7)=0
We get rid of parentheses
6x-4x+7-81=0
We add all the numbers together, and all the variables
2x-74=0
We move all terms containing x to the left, all other terms to the right
2x=74
x=74/2
x=37
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