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6x-15y=51
-
13y=-39
y=-3
maka x=3
y-x=-3-3=6
2x-5y=17 |1| 2x-5y=17
13x=13
x=1
3x-y=6
3(1)-y=6
3-y=6
-y=6-3
-y=3
y=-3
y-x
-3-1= -4