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2x+12=3x-3.1
We move all terms to the left:
2x+12-(3x-3.1)=0
We get rid of parentheses
2x-3x+3.1+12=0
We add all the numbers together, and all the variables
-1x+15.1=0
We move all terms containing x to the left, all other terms to the right
-x=-15.1
x=-15.1/-1
x=15+0.1/1
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