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-12 = x+9 x+9 -9 = -12 -9 x = -21
If f' (x) = x43, then f(x) = (1/44) x44 + C.
13
2x + 9
X = Y = 9 The answer must be 9, since it says it in the problem. x = 9, y=9, and x = y are all true based on the given info.