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3.1=x-1.2
We move all terms to the left:
3.1-(x-1.2)=0
We get rid of parentheses
-x+1.2+3.1=0
We add all the numbers together, and all the variables
-1x+4.3=0
We move all terms containing x to the left, all other terms to the right
-x=-4.3
x=-4.3/-1
x=4+0.3/1
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