If 2f(x)+f(1-x)=x , then what is f(x) equal to ?

Given equation is $2f(x) + f(1-x) = x$.

Replacing $x$ with $1-x$, we get:

$2f(1-x) + f(x) = 1-x$

Multiplying the first equation by $2$, we get:

$4f(x) + 2f(1-x) = 2x$

Subtracting the second equation from this, we get:

$3f(x) = 2x - (1-x)$

$3f(x) = 3x - 1$

$f(x) = x - \dfrac{1}{3}$

Answer: $x- \left(\dfrac{1}{3}\right)