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-x = -18
x = 18
x + y = 72
18 + y = 72
y = 72-18
y = 54
2x + y = 90
___________ _
-1 x = - 18
x = 18
* x + y = 72
18 + y = 72
y = 72 - 18
= 54
jadi, x = 18
y = 54