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4.2x-5.3=3.1
We move all terms to the left:
4.2x-5.3-(3.1)=0
We add all the numbers together, and all the variables
4.2x-8.4=0
We move all terms containing x to the left, all other terms to the right
4.2x=8.4
x=8.4/4.2
x=2
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