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MAKA
- =
=
⇔ y - 4 = 1
⇔ y = 1 - (-4)
⇔ y = 5
x + y - 2 = 7
⇔ x + 5 - 2 = 7
⇔ x + 3 = 7
⇔ x = 7 - 3
⇔ x = 4
Jadi nilai x = 4 dan nilai y = 5