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q in (-oo:+oo)
3-((4/9)*q) = -12 // + 12
3-((4/9)*q)+12 = 0
(-4/9)*q+3+12 = 0
15-4/9*q = 0 // - 15
-4/9*q = -15 // : -4/9
q = -15/(-4/9)
q = 135/4
q = 135/4
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