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q in (-oo:+oo)
(-4/7)*q-9 = -55/7 // + -55/7
(-4/7)*q-(-55/7)-9 = 0
(-4/7)*q+55/7-9 = 0
-4/7*q-8/7 = 0 // + 8/7
-4/7*q = 8/7 // : -4/7
q = 8/7/(-4/7)
q = -2
q = -2
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