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(3x-1)+3x-1=72
We move all terms to the left:
(3x-1)+3x-1-(72)=0
We add all the numbers together, and all the variables
3x+(3x-1)-73=0
We get rid of parentheses
3x+3x-1-73=0
We add all the numbers together, and all the variables
6x-74=0
We move all terms containing x to the left, all other terms to the right
6x=74
x=74/6
x=12+1/3
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