3n-21=4+8n

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Solution for 3n-21=4+8n equation:


Simplifying
3n + -21 = 4 + 8n

Reorder the terms:
-21 + 3n = 4 + 8n

Solving
-21 + 3n = 4 + 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 + 3n + -8n = 4 + 8n + -8n

Combine like terms: 3n + -8n = -5n
-21 + -5n = 4 + 8n + -8n

Combine like terms: 8n + -8n = 0
-21 + -5n = 4 + 0
-21 + -5n = 4

Add '21' to each side of the equation.
-21 + 21 + -5n = 4 + 21

Combine like terms: -21 + 21 = 0
0 + -5n = 4 + 21
-5n = 4 + 21

Combine like terms: 4 + 21 = 25
-5n = 25

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

Simplifying
n = -5

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