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q in (-oo:+oo)
1/4 = (7/8)*q // - (7/8)*q
1/4-((7/8)*q) = 0
(-7/8)*q+1/4 = 0
1/4-7/8*q = 0 // - 1/4
-7/8*q = -1/4 // : -7/8
q = -1/4/(-7/8)
q = 2/7
q = 2/7
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