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-0.1x+0.4(1-x)=0
We add all the numbers together, and all the variables
-0.1x+0.4(-1x+1)=0
We multiply parentheses
-0.1x-0.4x+0.4=0
We add all the numbers together, and all the variables
-0.5x+0.4=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-0.4
x=-0.4/-0.5
x=0.4/0.5
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