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x=4.2x+3.1
We move all terms to the left:
x-(4.2x+3.1)=0
We get rid of parentheses
x-4.2x-3.1=0
We add all the numbers together, and all the variables
-3.2x-3.1=0
We move all terms containing x to the left, all other terms to the right
-3.2x=3.1
x=3.1/-3.2
x=-1/1.0322580645161
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