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0.3x-2=3.1
We move all terms to the left:
0.3x-2-(3.1)=0
We add all the numbers together, and all the variables
0.3x-5.1=0
We move all terms containing x to the left, all other terms to the right
0.3x=5.1
x=5.1/0.3
x=17
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