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q in (-oo:+oo)
(-1/3)*q^7 = -3 // + 3
(-1/3)*q^7+3 = 0
-1/3*q^7 = -3 // : -1/3
q^7 = 9
q^7 = 9 // ^ 1/7
q = 9^(1/7)
q = 9^(1/7)
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