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3.9x-9.79=2.3
We move all terms to the left:
3.9x-9.79-(2.3)=0
We add all the numbers together, and all the variables
3.9x-12.09=0
We move all terms containing x to the left, all other terms to the right
3.9x=12.09
x=12.09/3.9
x=3+0.39/3.9
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