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2.6-1.3x=3.9
We move all terms to the left:
2.6-1.3x-(3.9)=0
We add all the numbers together, and all the variables
-1.3x-1.3=0
We move all terms containing x to the left, all other terms to the right
-1.3x=1.3
x=1.3/-1.3
x=-1
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