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ur output value is f(x).....so to do this problem u need to sub in 2/3 for f(x) and solve for the input value which is xf(x) = -1/3x + 72/3 = -1/3x + 7 ...multiply everything by 32 = -x + 212 - 21 = - x- 19 = -x19 = x <== ur output...