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-6-\left(1-8\right)-\left(1-9\right)
Subtract 7 from 1 to get -6.
-6-\left(-7\right)-\left(1-9\right)
Subtract 8 from 1 to get -7.
-6+7-\left(1-9\right)
The opposite of -7 is 7.
1-\left(1-9\right)
Add -6 and 7 to get 1.
1-\left(-8\right)
Subtract 9 from 1 to get -8.
1+8
The opposite of -8 is 8.
9
Add 1 and 8 to get 9.