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x in (-oo:+oo)
X/20 = x-(1/50) // - x-(1/50)
X/20-x+1/50 = 0
1/20*X-x+1/50 = 0 // - 1/20*X+1/50
-x = -(1/20*X+1/50) // * -1
x = 1/20*X+1/50
x = 1/20*X+1/50
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