4+(-21)=

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Solution for 4+(-21)= equation: 


Simplifying
4 + (-21) = 0
4 + -21 = 0

Combine like terms: 4 + -21 = -17
-17 = 0

Solving
-17 = 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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