3.1+(8.6+m)=0

Solution for 3.1+(8.6+m)=0 equation:

Simplifying
3.1 + (8.6 + m) = 0

Remove parenthesis around (8.6 + m)
3.1 + 8.6 + m = 0

Combine like terms: 3.1 + 8.6 = 11.7
11.7 + m = 0

Solving
11.7 + m = 0

Solving for variable 'm'.

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

Add '-11.7' to each side of the equation.
11.7 + -11.7 + m = 0 + -11.7

Combine like terms: 11.7 + -11.7 = 0.0
0.0 + m = 0 + -11.7
m = 0 + -11.7

Combine like terms: 0 + -11.7 = -11.7
m = -11.7

Simplifying
m = -11.7