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3.1x-1.2=-1.5x+8
We move all terms to the left:
3.1x-1.2-(-1.5x+8)=0
We get rid of parentheses
3.1x+1.5x-8-1.2=0
We add all the numbers together, and all the variables
4.6x-9.2=0
We move all terms containing x to the left, all other terms to the right
4.6x=9.2
x=9.2/4.6
x=2
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