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x in (-oo:+oo)
(7/8)*x = 4/10 // - 4/10
(7/8)*x-(4/10) = 0
(7/8)*x-2/5 = 0
7/8*x-2/5 = 0 // + 2/5
7/8*x = 2/5 // : 7/8
x = 2/5/7/8
x = 16/35
x = 16/35
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