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X-0.13X=3423
We move all terms to the left:
X-0.13X-(3423)=0
We add all the numbers together, and all the variables
0.87X-3423=0
We move all terms containing X to the left, all other terms to the right
0.87X=3423
X=3423/0.87
X=3934+0.42/0.87
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