Question 906278
y = {{{X+3}}}
Z+6=x 0r z = {{{x-6}}}
X+y+z=66  Sustituting for y and z
X + (X+3) + (X-6) = 66
3X = 69
X = 23, y = 9 and z = 17
And...checking
23 + 26 + 17 = 66