-21=3n-8n

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


Simplifying
-21 = 3n + -8n

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

Solving
-21 = -5n

Solving for variable 'n'.

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

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

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

Add '21' to each side of the equation.
-21 + 21 + 5n = 0 + 21

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

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

Divide each side by '5'.
n = 4.2

Simplifying
n = 4.2

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