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x in (-oo:+oo)
(7/8)*x = 21/64 // - 21/64
(7/8)*x-(21/64) = 0
(7/8)*x-21/64 = 0
7/8*x-21/64 = 0 // + 21/64
7/8*x = 21/64 // : 7/8
x = 21/64/7/8
x = 3/8
x = 3/8
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