21=n-3+7n

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Solution for 21=n-3+7n equation:


Simplifying
21 = n + -3 + 7n

Reorder the terms:
21 = -3 + n + 7n

Combine like terms: n + 7n = 8n
21 = -3 + 8n

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

Combine like terms: 8n + -8n = 0
21 + -8n = -3 + 0
21 + -8n = -3

Add '-21' to each side of the equation.
21 + -21 + -8n = -3 + -21

Combine like terms: 21 + -21 = 0
0 + -8n = -3 + -21
-8n = -3 + -21

Combine like terms: -3 + -21 = -24
-8n = -24

Divide each side by '-8'.
n = 3

Simplifying
n = 3

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