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x in (-oo:+oo)
x/91-(3*j^3) = 0
x/91-3*j^3 = 0
1/91*x-3*j^3 = 0 // + -3*j^3
1/91*x = -(-3*j^3) // : 1/91
x = (-(-3*j^3))/1/91
x = 273*j^3
x = 273*j^3
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