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x in (-oo:+oo)
(5/8)*x+13 = (7/8)*x-7 // - (7/8)*x-7
(5/8)*x-((7/8)*x)+7+13 = 0
(5/8)*x+(-7/8)*x+7+13 = 0
20-1/4*x = 0 // - 20
-1/4*x = -20 // : -1/4
x = -20/(-1/4)
x = 80
x = 80
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