.4-3=21

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Solution for .4-3=21 equation: 


Simplifying
0.4 + -3 = 21

Combine like terms: 0.4 + -3 = -2.6
-2.6 = 21

Solving
-2.6 = 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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