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X-3.1X=7.1
We move all terms to the left:
X-3.1X-(7.1)=0
We add all the numbers together, and all the variables
-2.1X-7.1=0
We move all terms containing X to the left, all other terms to the right
-2.1X=7.1
X=7.1/-2.1
X=-3+0.8/2.1
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