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My Mathematics is rusty.... can you solve this equation ?


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To help review a business problem IN THAILAND, can anyone with some more up to date maths skills ? 25 years back, no probs, not anymore. Trying to re look at the input of a non linear multiple regression



y=c+a1*z1+a2*z1^2+a3*z1^3+b1*z2+b2*z2^2+b3*z2^3



Looking to transpose the formula to z2=.......................




can't do it anymore. Basically using it for optimisation.


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