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5x + 2y = 94..... 2y + 5x = 94
5 + x = y.......... y - x = 5...(x2) kali dua
2y + 5x = 94
2y - 2x = 10 -
7x = 84
x =12
y = 5 + x= 17
jadi pulpen = 12 sen....penggaris= 17 sen