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q in (-oo:+oo)
7 = 6*q+8/4 // - 6*q+8/4
7-(6*q)-(8/4) = 0
7-6*q-2 = 0
5-6*q = 0 // - 5
-6*q = -5 // : -6
q = -5/(-6)
q = 5/6
q = 5/6
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