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11*a+7*b-((5/(10-5))*x^3) = 0
11*a+7*b-5*(10-5)^-1*x^3 = 0
-1*x^3 = -(11*a+7*b) // : -1
x^3 = 11*a+7*b
x^3 = 11*a+7*b // ^ 1/3
x = (11*a+7*b)^(1/3)
x = (11*a+7*b)^(1/3)
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