Question 345621
Use x-y format.
Interchange the position of x and y in your original function.
Then solve for y. 
The new y is the inverse of the original y.
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Example:
{{{y=2x+5}}}
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{{{x=2y+5}}}
{{{2y=x-5}}}
{{{highlight(y[inv]=(x-5)/2)}}}