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55*x^3-(-12/8) = 0
55*x^3+3/2 = 0
55*x^3 = -3/2 // : 55
x^3 = -3/110
x^3 = -3/110 // ^ 1/3
x = -(3/110)^(1/3)
x = -(3/110)^(1/3)
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