Finding formula for inverse function (Please Help!)

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: Hello, I hope someone can help me with this. : f(x)=(1+3x)/(2-2x) : I have to find the formula for the inverse function. : I get x= (-2*f(x)-1)/(s*f(x)-3), but it is wrong. : I divided both sides by (2-2x) : I distributed : I isolated for x terms : I factored out x : I divided both sides by coefficient of x : Any ideas what I'm doing wrong? : Thanks, Larry

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