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20(0.5)^x=1/20
We move all terms to the left:
20(0.5)^x-(1/20)=0
We add all the numbers together, and all the variables
20(0.5)^x-(+1/20)=0
We get rid of parentheses
20(0.5)^x-1/20=0
We multiply all the terms by the denominator
(20(0.5)^x)*20-1=0
We move all terms containing x to the left, all other terms to the right
(20(0.5)^x)*20=1
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