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2y - 5x = -8
x+y = 30
y = 30-x
subsitusikan ke 2y - 5x = -8
2(30-x) -5x = -8
60 - 2x -5x = -8
-7x = -68
x = 68/7
x = 9 5/7
y = 30-x
= 30 - 9 5/7
= 20 2/7