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x in (-oo:+oo)
(7/8)*x-(9/10) = -(1/8) // + 1/8
(7/8)*x-(9/10)+1/8 = 0
(7/8)*x-9/10+1/8 = 0
7/8*x-31/40 = 0 // + 31/40
7/8*x = 31/40 // : 7/8
x = 31/40/7/8
x = 31/35
x = 31/35
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