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