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x in (-oo:+oo)
(1/4)*x-(7/8) = 20-55 // - 20-55
(1/4)*x-(7/8)-20+55 = 0
(1/4)*x-7/8-20+55 = 0
1/4*x+273/8 = 0 // - 273/8
1/4*x = -273/8 // : 1/4
x = -273/8/1/4
x = -273/2
x = -273/2
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