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a+6b+a+7b=69
2a+13b=69
u3=12
a+2b=12
kali 2 agar di eliminasi
2a+4b=12
2a+13b=69
2a+4b=12
9b=57
b=57/9
a=⇒a+2b=12
a+114/9=12
a=12-114/9
a=-6/9= -2/3