f(x)=-(38x)/2+1/2x+4

f(x)=-3/8x/2+1/2x+ ?

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$f(x)=-3/8x/2+1/2x \\ =-\dfrac{3}{8}\cdot \dfrac{x}{2}+\dfrac{1}{2}x=\dfrac{3x}{16}+\dfrac{x}{2}=\dfrac{3x+8x}{16}=\color{blue}\dfrac{11}{16}x$

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