21=3n+3-3

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


Simplifying
21 = 3n + 3 + -3

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

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

Solving
21 = 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 = 3n + -3n

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

Add '-21' to each side of the equation.
21 + -21 + -3n = 0 + -21

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

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

Divide each side by '-3'.
n = 7

Simplifying
n = 7

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