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x in (-oo:+oo)
(7/8)*x-(3/8) = 3 // - 3
(7/8)*x-(3/8)-3 = 0
(7/8)*x-3/8-3 = 0
7/8*x-27/8 = 0 // + 27/8
7/8*x = 27/8 // : 7/8
x = 27/8/7/8
x = 27/7
x = 27/7
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