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13.9+3x=2.8+6x
We move all terms to the left:
13.9+3x-(2.8+6x)=0
We add all the numbers together, and all the variables
3x-(6x+2.8)+13.9=0
We get rid of parentheses
3x-6x-2.8+13.9=0
We add all the numbers together, and all the variables
-3x+11.1=0
We move all terms containing x to the left, all other terms to the right
-3x=-11.1
x=-11.1/-3
x=3+2.1/3
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