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2.1x-13.91=3.1
We move all terms to the left:
2.1x-13.91-(3.1)=0
We add all the numbers together, and all the variables
2.1x-17.01=0
We move all terms containing x to the left, all other terms to the right
2.1x=17.01
x=17.01/2.1
x=8+0.21/2.1
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