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3y=2x+12
3y-2x=12....pers 1
4x-3y=-18....pers 2
jumlah kan persamaan 1 dan 2
didapat
3y+(-3y)-2x+4x=12+(-18)
2x=6
x=3
subs nilai x ke salah satu persamaan
didapat y=10
maka hp =( 3, 10)