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q in (-oo:+oo)
(-1/3)*q+7 = -3 // + 3
(-1/3)*q+3+7 = 0
10-1/3*q = 0 // - 10
-1/3*q = -10 // : -1/3
q = -10/(-1/3)
q = 30
q = 30
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