21=1+8n+4

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Solution for 21=1+8n+4 equation:


Simplifying
21 = 1 + 8n + 4

Reorder the terms:
21 = 1 + 4 + 8n

Combine like terms: 1 + 4 = 5
21 = 5 + 8n

Solving
21 = 5 + 8n

Solving for variable 'n'.

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

Add '-8n' to each side of the equation.
21 + -8n = 5 + 8n + -8n

Combine like terms: 8n + -8n = 0
21 + -8n = 5 + 0
21 + -8n = 5

Add '-21' to each side of the equation.
21 + -21 + -8n = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -8n = 5 + -21
-8n = 5 + -21

Combine like terms: 5 + -21 = -16
-8n = -16

Divide each side by '-8'.
n = 2

Simplifying
n = 2

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