1.5+2.1=2.8n-1.8n+8.9

Solution for 1.5+2.1=2.8n-1.8n+8.9 equation:

Simplifying
1.5 + 2.1 = 2.8n + -1.8n + 8.9

Combine like terms: 1.5 + 2.1 = 3.6
3.6 = 2.8n + -1.8n + 8.9

Reorder the terms:
3.6 = 8.9 + 2.8n + -1.8n

Combine like terms: 2.8n + -1.8n = 1n
3.6 = 8.9 + 1n

Solving
3.6 = 8.9 + 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.
3.6 + -1n = 8.9 + 1n + -1n

Combine like terms: 1n + -1n = 0
3.6 + -1n = 8.9 + 0
3.6 + -1n = 8.9

Add '-3.6' to each side of the equation.
3.6 + -3.6 + -1n = 8.9 + -3.6

Combine like terms: 3.6 + -3.6 = 0.0
0.0 + -1n = 8.9 + -3.6
-1n = 8.9 + -3.6

Combine like terms: 8.9 + -3.6 = 5.3
-1n = 5.3

Divide each side by '-1'.
n = -5.3

Simplifying
n = -5.3