9-(-11)+(-21)=

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Solution for 9-(-11)+(-21)= equation: 


Simplifying
9 + -1(-11) + (-21) = 0

Multiply -1 * -11
9 + 11 + (-21) = 0
9 + 11 + -21 = 0

Combine like terms: 9 + 11 = 20
20 + -21 = 0

Combine like terms: 20 + -21 = -1
-1 = 0

Solving
-1 = 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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