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X-0.1X+6.3=12.6
We move all terms to the left:
X-0.1X+6.3-(12.6)=0
We add all the numbers together, and all the variables
0.9X-6.3=0
We move all terms containing X to the left, all other terms to the right
0.9X=6.3
X=6.3/0.9
X=7
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