SOLUTION: if f(3x + 1) = 12x- 7 then find f(x) Confused by x on two sides. Thank you for helping!

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Question 789840: if f(3x + 1) = 12x- 7 then find f(x)
Confused by x on two sides.
Thank you for helping!
Answer by rothauserc(4718) About Me  (Show Source):
You can put this solution on YOUR website!
note that 4*3 = 12 and 4 -11 = -7, therefore
f(x) = 4x -11 and
f(3x+1) = 4*(3x+1) -11 = 12x+4 -11 = 12x -7