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Question Number 147914 by mnjuly1970 last updated on 24/Jul/21

    f (x ):= 3x +[ (x/4) ]  , D_( f)  =[ 0,∞)           f^( −1) ( x )= ?

$$ \\ $$$$\:\:{f}\:\left({x}\:\right):=\:\mathrm{3}{x}\:+\left[\:\frac{{x}}{\mathrm{4}}\:\right]\:\:,\:\mathrm{D}_{\:{f}} \:=\left[\:\mathrm{0},\infty\right) \\ $$$$\:\:\:\:\:\:\:\:\:{f}^{\:−\mathrm{1}} \left(\:{x}\:\right)=\:? \\ $$$$ \\ $$

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