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x^2 - 1 = 2x - 6
x^2 - 2x -1 + 6 = 0
x^2 - 2x + 5 = 0
sehingga a = 1, b = -2, c = 5
jadi a + b + c = 1 + (-2) + 5 = 1 - 2 + 5 = 4
X2-1=2X-6
X2-2X+5=0
Jadi A=1
B=-2
C=5
A+B+C=?
1+(-2)+5=4