3-18=21

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Solution for 3-18=21 equation: 


Simplifying
3 + -18 = 21

Combine like terms: 3 + -18 = -15
-15 = 21

Solving
-15 = 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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