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q in (-oo:+oo)
(1/3)*q = 7/8 // - 7/8
(1/3)*q-(7/8) = 0
(1/3)*q-7/8 = 0
1/3*q-7/8 = 0 // + 7/8
1/3*q = 7/8 // : 1/3
q = 7/8/1/3
q = 21/8
q = 21/8
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