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x in (-oo:+oo)
X/8 = x+3/20 // - x+3/20
X/8-x-(3/20) = 0
X/8-x-3/20 = 0
1/8*X-x-3/20 = 0 // - 1/8*X-3/20
-x = -(1/8*X-3/20) // * -1
x = 1/8*X-3/20
x = 1/8*X-3/20
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