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-5x+ y=27 (dikali 2)
10x-15y=80
10x+2y=54
_____________ _
0 -13y=26
y=2
2x-3y=16 (dikali 1)
-5x+y =27 (dikali 3)
2x-3y=16
-15x+3y=71
______________ _
-13x+0=55
x=4,23