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-x + 5y = -4 |x 3| -3x + 15y = -12
------------------------ +
13y = -11 <-> y = -11/13
3x - 22/13 = 1
3x = 35/13
x = 35/39
- x + 5y = - 4
eliminasi:
15x - 10y = 5
- 2x + 10y = - 8
____________ +
13x = - 3
x = - 3/13
y = - 11/13