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kalo bingung bisa ditanyakan :)
2x -y = -1 |x2
3x +2y = 23
4x -2y = -2
__________ =
7x = 21
x = 3
subtitusi nilai x
2x-y = -1
2.3 -y = -1
6 -y = -1
-y = -1-6
y= 7
nilai xy= 3.7 = 21