-21=7-4

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Solution for -21=7-4 equation: 


Simplifying
-21 = 7 + -4

Combine like terms: 7 + -4 = 3
-21 = 3

Solving
-21 = 3

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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