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x in (-oo:+oo)
9/20-(1/5) = x-(9/4) // - x-(9/4)
9/20-x-(1/5)+9/4 = 0
9/20-x-1/5+9/4 = 0
5/2-x = 0 // - 5/2
-x = -5/2 // * -1
x = 5/2
x = 5/2
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