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q in (-oo:+oo)
(2/3)*q = 10/13 // - 10/13
(2/3)*q-(10/13) = 0
(2/3)*q-10/13 = 0
2/3*q-10/13 = 0 // + 10/13
2/3*q = 10/13 // : 2/3
q = 10/13/2/3
q = 15/13
q = 15/13
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