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x=0.4x+3
We move all terms to the left:
x-(0.4x+3)=0
We get rid of parentheses
x-0.4x-3=0
We add all the numbers together, and all the variables
0.6x-3=0
We move all terms containing x to the left, all other terms to the right
0.6x=3
x=3/0.6
x=5
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