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3x+y=9 (dikali 2)
x+2y=8 persamaan 1
6x+2y=18 persamaan 2
pers. 1 - pers 2 (eliminasi)
-5x=-10
x= -10/-5
x=2
masukin x=2 ke pers 1 (substitusi)
2+2y=8
2y=8-2
2y=6
y=3