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x in (-oo:+oo)
q^3*x = 1/243 // - 1/243
q^3*x-(1/243) = 0
q^3*x-1/243 = 0
q^3*x-1/243 = 0 // + 1/243
q^3*x = 1/243 // : q^3
x = 1/243/(q^3)
x = 1/243/(q^3)
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