m+8.4=-3.9

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Solution for m+8.4=-3.9 equation: 


Simplifying
m + 8.4 = -3.9

Reorder the terms:
8.4 + m = -3.9

Solving
8.4 + m = -3.9

Solving for variable 'm'.

Move all terms containing m to the left, all other terms to the right.

Add '-8.4' to each side of the equation.
8.4 + -8.4 + m = -3.9 + -8.4

Combine like terms: 8.4 + -8.4 = 0.0
0.0 + m = -3.9 + -8.4
m = -3.9 + -8.4

Combine like terms: -3.9 + -8.4 = -12.3
m = -12.3

Simplifying
m = -12.3

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