Jawapan

2016-06-02T21:43:33+08:00
X + y + z = 36
x = p
y = x - 9
x - 9 = p
p = x - 9
z = y + 12

z = x - 9 + 12
   = x + 3

p + x - 9 + y + 12 = 36
p + x + y = 33
p = 33 - x - y
p = 33 - p - x + 9
2p = 42 - x
p = 21 - x/2
x - 9 = 21 - x/2
2x - 18 = 42 - x
3x = 60
x = 20
x = p
p = 20
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