4.2+5+3.9+n=21.5

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Solution for 4.2+5+3.9+n=21.5 equation: 


Simplifying
4.2 + 5 + 3.9 + n = 21.5

Combine like terms: 4.2 + 5 = 9.2
9.2 + 3.9 + n = 21.5

Combine like terms: 9.2 + 3.9 = 13.1
13.1 + n = 21.5

Solving
13.1 + n = 21.5

Solving for variable 'n'.

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

Add '-13.1' to each side of the equation.
13.1 + -13.1 + n = 21.5 + -13.1

Combine like terms: 13.1 + -13.1 = 0.0
0.0 + n = 21.5 + -13.1
n = 21.5 + -13.1

Combine like terms: 21.5 + -13.1 = 8.4
n = 8.4

Simplifying
n = 8.4

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