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x = y + z + 5
y = 1/4 ( x + z)
(y + z + 5) + y + z = 75
2y + 2z = 70.....
y + z = 35 .... maka x = 75 - 35 = 40
y = 1/4(40+z)...
35 - z = 10 + 1/4z
25 = 5/4z
z = 4/5*25 = 20
y= 35-20 = 15
jadi :
x = 40, y =15, z = 20