-1-(10-(-9))=

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Solution for -1-(10-(-9))= equation: 


Simplifying
-1 + -1(10 + -1(-9)) = 0

Multiply -1 * -9
-1 + -1(10 + 9) = 0

Combine like terms: 10 + 9 = 19
-1 + -1(19) = 0

Multiply -1 * 19
-1 + -19 = 0

Combine like terms: -1 + -19 = -20
-20 = 0

Solving
-20 = 0

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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