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-x + 5y = 4 | x2 | -2x + 10y = 8
+
13x = 13
x = 13
13
= 1
3x - 2y = 1 |x1| 3x - 2y = 1
-x + 5y = 4 |x3| -3x + 15y = 12
+
13y = 13
y = 13
13
= 1