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jadi, a-b=0-3=-3 dan a+b=0+3=3
2a+b=3. ...(2)
2a+4b=12. ...(3)
(3)-(2)
3b=9
b=3. subtitusikan b ke pers. (2)
a=0
(a-b) = -3
(a+b) = 3