what is the equation of the inverse of F(x)=x/2-1

what is the inverse equation of    F(x)=x/2-1
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Let y=f(x)=x/2-1, 2y=x-2, x=2y+2. Let x=g(y)=2y+2, so g(x)=f⁻¹(x)=2x+2.

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