x+3.1+x+2.1=

Solution for x+3.1+x+2.1= equation:

Simplifying
x + 3.1 + x + 2.1 = 0

Reorder the terms:
3.1 + 2.1 + x + x = 0

Combine like terms: 3.1 + 2.1 = 5.2
5.2 + x + x = 0

Combine like terms: x + x = 2x
5.2 + 2x = 0

Solving
5.2 + 2x = 0

Solving for variable 'x'.

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

Add '-5.2' to each side of the equation.
5.2 + -5.2 + 2x = 0 + -5.2

Combine like terms: 5.2 + -5.2 = 0.0
0.0 + 2x = 0 + -5.2
2x = 0 + -5.2

Combine like terms: 0 + -5.2 = -5.2
2x = -5.2

Divide each side by '2'.
x = -2.6

Simplifying
x = -2.6