f(x) = 2x/(7 + 4)
Replace f(x) with y
y = 2x/(7 + 4)
Switch x and y
x = 2y/(7 + 4)
Solve for y
Simplify first
x = 2y/11
* 11
11x = 2y
/2
5.5x = y
Turn y into f^-1(x)
f^-1(x) = 5.5x
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