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x in (-oo:+oo)
(1/4)*x-(5/8) = 20-47 // - 20-47
(1/4)*x-(5/8)-20+47 = 0
(1/4)*x-5/8-20+47 = 0
1/4*x+211/8 = 0 // - 211/8
1/4*x = -211/8 // : 1/4
x = -211/8/1/4
x = -211/2
x = -211/2
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