2n-6+21=5

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Solution for 2n-6+21=5 equation: 


Simplifying
2n + -6 + 21 = 5

Reorder the terms:
-6 + 21 + 2n = 5

Combine like terms: -6 + 21 = 15
15 + 2n = 5

Solving
15 + 2n = 5

Solving for variable 'n'.

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

Add '-15' to each side of the equation.
15 + -15 + 2n = 5 + -15

Combine like terms: 15 + -15 = 0
0 + 2n = 5 + -15
2n = 5 + -15

Combine like terms: 5 + -15 = -10
2n = -10

Divide each side by '2'.
n = -5

Simplifying
n = -5

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