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2x+x+11.5=125
We move all terms to the left:
2x+x+11.5-(125)=0
We add all the numbers together, and all the variables
3x-113.5=0
We move all terms containing x to the left, all other terms to the right
3x=113.5
x=113.5/3
x=37+2.5/3
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