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(x-0.4x)-0.4(x-0.4x)=0
We add all the numbers together, and all the variables
(+0.6x)-0.4(+0.6x)=0
We multiply parentheses
(+0.6x)-0x=0
We get rid of parentheses
0.6x-0x=0
We add all the numbers together, and all the variables
-0.4x=0
x=0/-0.4
x=0
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