Define f(x) once, then solve equations that use it β plus plain quadratic & rational equations.
β
f(x+1) β f(2x) = 0.5
xΒ² β 9 = 0
same eq., written out
\frac{β¦}=\frac12
1/x + 1/(x+2) = 1
f(x) = 0.5x+4