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q in (-oo:+oo)
(3/5)*q = -4/9 // + -4/9
(3/5)*q-(-4/9) = 0
(3/5)*q+4/9 = 0
3/5*q+4/9 = 0 // - 4/9
3/5*q = -4/9 // : 3/5
q = -4/9/3/5
q = -20/27
q = -20/27
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