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x=0.2x+0.4
We move all terms to the left:
x-(0.2x+0.4)=0
We get rid of parentheses
x-0.2x-0.4=0
We add all the numbers together, and all the variables
0.8x-0.4=0
We move all terms containing x to the left, all other terms to the right
0.8x=0.4
x=0.4/0.8
x=0.4/0.8
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