2.6+.9n=-(-n-2.1)

Solution for 2.6+.9n=-(-n-2.1) equation:

Simplifying
2.6 + 0.9n = -1(-1n + -2.1)

Reorder the terms:
2.6 + 0.9n = -1(-2.1 + -1n)
2.6 + 0.9n = (-2.1 * -1 + -1n * -1)
2.6 + 0.9n = (2.1 + 1n)

Solving
2.6 + 0.9n = 2.1 + 1n

Solving for variable 'n'.

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

Add '-1n' to each side of the equation.
2.6 + 0.9n + -1n = 2.1 + 1n + -1n

Combine like terms: 0.9n + -1n = -0.1n
2.6 + -0.1n = 2.1 + 1n + -1n

Combine like terms: 1n + -1n = 0
2.6 + -0.1n = 2.1 + 0
2.6 + -0.1n = 2.1

Add '-2.6' to each side of the equation.
2.6 + -2.6 + -0.1n = 2.1 + -2.6

Combine like terms: 2.6 + -2.6 = 0.0
0.0 + -0.1n = 2.1 + -2.6
-0.1n = 2.1 + -2.6

Combine like terms: 2.1 + -2.6 = -0.5
-0.1n = -0.5

Divide each side by '-0.1'.
n = 5

Simplifying
n = 5