f(x) = (3x+5)/(-x+2)
y = (3x+5)/(-x+2)
y(-x+2) = 3x+5
-xy+2y = 3x+5
-xy-3x = 5-2y
x(-y-3) = 5-2y
x = (5-2y)/(-y-3)
f^-1(x) = (5-2x)/(-x-3)
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f(x) = (3x+5)/(-x+2)
y = (3x+5)/(-x+2)
y(-x+2) = 3x+5
-xy+2y = 3x+5
-xy-3x = 5-2y
x(-y-3) = 5-2y
x = (5-2y)/(-y-3)
f^-1(x) = (5-2x)/(-x-3)