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atau salah tulis soal
semoga membantu
x -y = -3 ---------> x = -3 +y
2x -y = 6
2(-3 +y) = 6
-6 +2y = 6
2y = 6 +6
2y = 12
y = 6
x = -3 +y
= -3 +6
= 3
Maka, nilai :
x -y
= 3 -6
= -3
Itu jawabannya.