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