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2x-3+x+2x-3x=72
We move all terms to the left:
2x-3+x+2x-3x-(72)=0
We add all the numbers together, and all the variables
2x-75=0
We move all terms containing x to the left, all other terms to the right
2x=75
x=75/2
x=37+1/2
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