840-0.4=

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Solution for 840-0.4= equation: 


Simplifying
840 + -0.4 = 0

Combine like terms: 840 + -0.4 = 839.6
839.6 = 0

Solving
839.6 = 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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