21(21-21)=21

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Solution for 21(21-21)=21 equation: 


Simplifying
21(21 + -21) = 21

Combine like terms: 21 + -21 = 0
21(0) = 21

Multiply 21 * 0
0 = 21

Anything times zero is zero.
0 = 21

Solving
0 = 21

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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