invers dari f(x)= -3x-1/5+2x

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

Semoga membantu :)