21=-6+3n

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Solution for 21=-6+3n equation: 


Simplifying
21 = -6 + 3n

Solving
21 = -6 + 3n

Solving for variable 'n'.

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

Add '-3n' to each side of the equation.
21 + -3n = -6 + 3n + -3n

Combine like terms: 3n + -3n = 0
21 + -3n = -6 + 0
21 + -3n = -6

Add '-21' to each side of the equation.
21 + -21 + -3n = -6 + -21

Combine like terms: 21 + -21 = 0
0 + -3n = -6 + -21
-3n = -6 + -21

Combine like terms: -6 + -21 = -27
-3n = -27

Divide each side by '-3'.
n = 9

Simplifying
n = 9

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