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3x - y = - 11 | x 5 | 15 x - 5y = -55
2x + 5y = 21 | x 1 | 2 x + 5y = 21
lalu jumlahkan hasilnya 17 x = -34
x = -2
lalu substitusikan ke y
3x - y = -11
3(-2) - y = -11
-y = -11 +6
-y = -5
y=5