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X+X+3X=12.50
We move all terms to the left:
X+X+3X-(12.50)=0
We add all the numbers together, and all the variables
X+X+3X-(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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