Evaluate expression

Calculate the value of the expression z/3 - 2 z/9 + 1/6, for z = 2

Correct result:

x =  0.3889

Solution:

z=2 x=z/3−2⋅ z/9+1/6=2/3−2⋅ 2/9+1/6=718=0.3889

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