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3x + 5y = 12 | dikali 2
menjadi
35x + 10y = -5
6x + 10 y = 24
(di kurangi menjadi)
29x = -29
x = -1
7x + 2y = -1
7(-1) + 2y = -1
2y = 6
y = 3
5x - 3y =
5(-1) - 3(3) =
- 5 - 9 =
- 14