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x in (-oo:+oo)
(7/8)*x-(1/7) = 1/2 // - 1/2
(7/8)*x-(1/7)-(1/2) = 0
(7/8)*x-1/7-1/2 = 0
7/8*x-9/14 = 0 // + 9/14
7/8*x = 9/14 // : 7/8
x = 9/14/7/8
x = 36/49
x = 36/49
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