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x=0.20x+40
We move all terms to the left:
x-(0.20x+40)=0
We get rid of parentheses
x-0.20x-40=0
We add all the numbers together, and all the variables
0.8x-40=0
We move all terms containing x to the left, all other terms to the right
0.8x=40
x=40/0.8
x=50
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