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2.6x-13.88=6.4
We move all terms to the left:
2.6x-13.88-(6.4)=0
We add all the numbers together, and all the variables
2.6x-20.28=0
We move all terms containing x to the left, all other terms to the right
2.6x=20.28
x=20.28/2.6
x=7+1/1.25
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