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x in (-oo:+oo)
(7/8)*x = 14/40 // - 14/40
(7/8)*x-(14/40) = 0
(7/8)*x-7/20 = 0
7/8*x-7/20 = 0 // + 7/20
7/8*x = 7/20 // : 7/8
x = 7/20/7/8
x = 2/5
x = 2/5
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