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.4x=x-16.8
We move all terms to the left:
.4x-(x-16.8)=0
We get rid of parentheses
.4x-x+16.8=0
We add all the numbers together, and all the variables
-0.6x+16.8=0
We move all terms containing x to the left, all other terms to the right
-0.6x=-16.8
x=-16.8/-0.6
x=+28
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