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x in (-oo:+oo)
(1/4)*x-((7/8)*x) = 20-5 // - 20-5
(1/4)*x-((7/8)*x)-20+5 = 0
(1/4)*x+(-7/8)*x-20+5 = 0
-5/8*x-15 = 0 // + 15
-5/8*x = 15 // : -5/8
x = 15/(-5/8)
x = -24
x = -24
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