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X+0.3X=0.5
We move all terms to the left:
X+0.3X-(0.5)=0
We add all the numbers together, and all the variables
1.3X-0.5=0
We move all terms containing X to the left, all other terms to the right
1.3X=0.5
X=0.5/1.3
X=0.5/1.3
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