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2x-3y= 16 kali 3 6x-9y=48
kurangi 23y= -46
jdi y=-2
3x+7y=1
3x +7.-2= 1
3x+(-14)=1
3x-14=1
3x= 1+14
x=15/3
x=5
jadi hasil xy= 5.-2 =-10