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1-2.4x=x-3.9
We move all terms to the left:
1-2.4x-(x-3.9)=0
We get rid of parentheses
-2.4x-x+3.9+1=0
We add all the numbers together, and all the variables
-3.4x+4.9=0
We move all terms containing x to the left, all other terms to the right
-3.4x=-4.9
x=-4.9/-3.4
x=1+1/2.2666666666667
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