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x+3x=2x+108.
We move all terms to the left:
x+3x-(2x+108.)=0
We add all the numbers together, and all the variables
x+3x-(2x+108)=0
We add all the numbers together, and all the variables
4x-(2x+108)=0
We get rid of parentheses
4x-2x-108=0
We add all the numbers together, and all the variables
2x-108=0
We move all terms containing x to the left, all other terms to the right
2x=108
x=108/2
x=54
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