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Your equation is: f(x) = 12 + 4xSolve for x. Subtract 12 to both sides of this equation to get: f(x) -12 = 4x Divide both sides of this equation by 4 to get: (f(x) -12)/4 = x Since, in general, a = b implies that b = a, this equation becomes: x = (f(x) - 12)/4Replace x with f(x) and replace f(x) with x to get: f(x) = (x-12)/4That's your inverse function.

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