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0.4x=x+42
We move all terms to the left:
0.4x-(x+42)=0
We get rid of parentheses
0.4x-x-42=0
We add all the numbers together, and all the variables
-0.6x-42=0
We move all terms containing x to the left, all other terms to the right
-0.6x=42
x=42/-0.6
x=-70
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