9-a-a=-1

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Solution for 9-a-a=-1 equation: 


a in (-oo:+oo)

9-a-a = -1 // + 1

1-a-a+9 = 0

10-2*a = 0 // - 10

-2*a = -10 // : -2

a = -10/(-2)

a = 5

a = 5

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