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x in (-oo:+oo)
(7/8)*x = 5/4 // - 5/4
(7/8)*x-(5/4) = 0
(7/8)*x-5/4 = 0
7/8*x-5/4 = 0 // + 5/4
7/8*x = 5/4 // : 7/8
x = 5/4/7/8
x = 10/7
x = 10/7
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