21+(-20)=

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Solution for 21+(-20)= equation: 


Simplifying
21 + (-20) = 0
21 + -20 = 0

Combine like terms: 21 + -20 = 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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