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x - 2y = -7. × 1
__________
4x - 2y = 10
x - 2y = -7
_________ -
3x = 17
x = 17/3
x= 5,6 atau dibulatkan menjadi 6
x sudah di ketahui tinggal mencari y caranya menggunakan subtitusi
2x - y = 5
2(6) - y = 5
12 - y = 5
-y = 5 - 12
y = 7