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q in (-oo:+oo)
q/(-3)+2.53 = 6.53 // - 6.53
q/(-3)-6.53+2.53 = 0
-1/3*q-4 = 0 // + 4
-1/3*q = 4 // : -1/3
q = 4/(-1/3)
q = -12
q = -12
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