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x1+x2+x3=2
x1.x2.x3=6
sesuai rumus x1+x2+x3=-b/a = 6/a
6a=2 ...... a= 1/3
x1.x2.x3 = d/a= -3b/a
6 = -3b / (1/3) ..... 3b = - 6 . 1/3 = -2
a+b =1/3 -2 = - 1 2/3