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maka:
5x+y = 2 |.3
15x+4y = 11
-----------------------
15x +3y =6
15x +4y=11
------------------------- kurang
y = 5
subsitusikan y
5x+y =2
5x +5 =2
5x = 2-5
5x =3
x= 3/5
15x-7=0
15x=7
x=7/15
5(7/15)=2-y
21=2-y
-19=y