21-3n=-3(3n-3)

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Solution for 21-3n=-3(3n-3) equation:


Simplifying
21 + -3n = -3(3n + -3)

Reorder the terms:
21 + -3n = -3(-3 + 3n)
21 + -3n = (-3 * -3 + 3n * -3)
21 + -3n = (9 + -9n)

Solving
21 + -3n = 9 + -9n

Solving for variable 'n'.

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

Add '9n' to each side of the equation.
21 + -3n + 9n = 9 + -9n + 9n

Combine like terms: -3n + 9n = 6n
21 + 6n = 9 + -9n + 9n

Combine like terms: -9n + 9n = 0
21 + 6n = 9 + 0
21 + 6n = 9

Add '-21' to each side of the equation.
21 + -21 + 6n = 9 + -21

Combine like terms: 21 + -21 = 0
0 + 6n = 9 + -21
6n = 9 + -21

Combine like terms: 9 + -21 = -12
6n = -12

Divide each side by '6'.
n = -2

Simplifying
n = -2

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