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x in (-oo:+oo)
(1/4)*x-((5/8)*x) = 25-49 // - 25-49
(1/4)*x-((5/8)*x)-25+49 = 0
(1/4)*x+(-5/8)*x-25+49 = 0
24-3/8*x = 0 // - 24
-3/8*x = -24 // : -3/8
x = -24/(-3/8)
x = 64
x = 64
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