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3x+x+x=12.5
We move all terms to the left:
3x+x+x-(12.5)=0
We add all the numbers together, and all the variables
5x-12.5=0
We move all terms containing x to the left, all other terms to the right
5x=12.5
x=12.5/5
x=2+2.5/5
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