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3.9x-12.61=6.5
We move all terms to the left:
3.9x-12.61-(6.5)=0
We add all the numbers together, and all the variables
3.9x-19.11=0
We move all terms containing x to the left, all other terms to the right
3.9x=19.11
x=19.11/3.9
x=4+1/1.1111111111111
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