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X+3X=3.62
We move all terms to the left:
X+3X-(3.62)=0
We add all the numbers together, and all the variables
4X-3.62=0
We move all terms containing X to the left, all other terms to the right
4X=3.62
X=3.62/4
X=2.2345679012346/2.4691358024691
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