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X+3.2+X=15.6
We move all terms to the left:
X+3.2+X-(15.6)=0
We add all the numbers together, and all the variables
2X-12.4=0
We move all terms containing X to the left, all other terms to the right
2X=12.4
X=12.4/2
X=6+0.4/2
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