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x+6=4x-0.4
We move all terms to the left:
x+6-(4x-0.4)=0
We get rid of parentheses
x-4x+0.4+6=0
We add all the numbers together, and all the variables
-3x+6.4=0
We move all terms containing x to the left, all other terms to the right
-3x=-6.4
x=-6.4/-3
x=2+0.4/3
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