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q in (-oo:+oo)
-7*q-(6/2) = -31 // + 31
31-7*q-(6/2) = 0
31-7*q-3 = 0
28-7*q = 0 // - 28
-7*q = -28 // : -7
q = -28/(-7)
q = 4
q = 4
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