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X+3X=8.50
We move all terms to the left:
X+3X-(8.50)=0
We add all the numbers together, and all the variables
X+3X-(8.5)=0
We add all the numbers together, and all the variables
4X-8.5=0
We move all terms containing X to the left, all other terms to the right
4X=8.5
X=8.5/4
X=2+0.5/4
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