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.4x=x+300
We move all terms to the left:
.4x-(x+300)=0
We get rid of parentheses
.4x-x-300=0
We add all the numbers together, and all the variables
-0.6x-300=0
We move all terms containing x to the left, all other terms to the right
-0.6x=300
x=300/-0.6
x=-500
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