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-16=0.4x
We move all terms to the left:
-16-(0.4x)=0
We add all the numbers together, and all the variables
-(+0.4x)-16=0
We get rid of parentheses
-0.4x-16=0
We move all terms containing x to the left, all other terms to the right
-0.4x=16
x=16/-0.4
x=-40
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