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3.9x=2.7x+7.2
We move all terms to the left:
3.9x-(2.7x+7.2)=0
We get rid of parentheses
3.9x-2.7x-7.2=0
We add all the numbers together, and all the variables
1.2x-7.2=0
We move all terms containing x to the left, all other terms to the right
1.2x=7.2
x=7.2/1.2
x=6+8.881784197E-16/1.2
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