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5x + 3y = 7 ⇔ 25x + 15y = 35 +
37 x = 74
x = 2
4x - 5y = 13 ⇔ 8 - 5y = 13
- 5y = 13 - 8
-5y = 5
y = -1
jadi nilai x = 2 dan nilai y = -1