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(x-20)/300-(x/300) = 1.25 // - 1.25
(x-20)/300-(x/300)-1.25 = 0
(x-20)/300-x/300-1.25 = 0
(x-20)/300-x/300+(-1.25*300)/300 = 0
x-x-1.25*300-20 = 0
-375-20 = 0
-395 = 0
-395/300 = 0
-395/300 = 0 // * 300
-395 = 0
-395 = 0
x belongs to the empty set
x belongs to the empty set
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