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x in (-oo:+oo)
X/4+x/1 = 20 // - 20
X/4+x/1-20 = 0
X/4+x-20 = 0
1/4*X+x-20 = 0 // - 1/4*X-20
x = -(1/4*X-20)
x = 20-(1/4*X)
x = 20-(1/4*X)
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