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q in (-oo:+oo)
(2/3)*q-(5/12) = 13/20 // - 13/20
(2/3)*q-(5/12)-(13/20) = 0
(2/3)*q-5/12-13/20 = 0
2/3*q-16/15 = 0 // + 16/15
2/3*q = 16/15 // : 2/3
q = 16/15/2/3
q = 8/5
q = 8/5
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