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2.5x=3.8x+3.9
We move all terms to the left:
2.5x-(3.8x+3.9)=0
We get rid of parentheses
2.5x-3.8x-3.9=0
We add all the numbers together, and all the variables
-1.3x-3.9=0
We move all terms containing x to the left, all other terms to the right
-1.3x=3.9
x=3.9/-1.3
x=-3+-4.4408920985E-16/1.3
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