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11x+3y+7=0 -> 11x+3y=-7 | x5
2x+5y-21=0 -> 2x+5y=21 | x3
55x+15y=-35
6x+15y=63
------------------ -
49x = -98
x = 2
Subtitusi x=2 ke 2x+5y-21=0
2(2)+5y=21
5y= 21-4 = 17
Y= 3.4