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q in (-oo:+oo)
(12*q)/(-7) = 30/14 // - 30/14
(12*q)/(-7)-(30/14) = 0
(12*q)/(-7)-15/7 = 0
-12/7*q-15/7 = 0 // + 15/7
-12/7*q = 15/7 // : -12/7
q = 15/7/(-12/7)
q = -5/4
q = -5/4
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