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(x/20)+(x/90)+(x/180)=1
We move all terms to the left:
(x/20)+(x/90)+(x/180)-(1)=0
We add all the numbers together, and all the variables
(+x/20)+(+x/90)+(+x/180)-1=0
We get rid of parentheses
x/20+x/90+x/180-1=0
We calculate fractions
There is no solution for this equation
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