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6X+4Y=-8 (X2) 12X+8Y=-16 - (DI KURANGI)
-17Y=85
Y=85/-17
Y=-5 HP{(2,-5)}
4X-3Y=23 (X4) 16X-12 Y =92
6X+4Y=-8 (X3) 18X+12Y=-24 (DI TAMBAH)
34 X =68
X =68/34
X =2
3x-y=3*2-(1*-5)
=6+5
=11