9=2n-21

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Solution for 9=2n-21 equation:


Simplifying
9 = 2n + -21

Reorder the terms:
9 = -21 + 2n

Solving
9 = -21 + 2n

Solving for variable 'n'.

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

Add '-2n' to each side of the equation.
9 + -2n = -21 + 2n + -2n

Combine like terms: 2n + -2n = 0
9 + -2n = -21 + 0
9 + -2n = -21

Add '-9' to each side of the equation.
9 + -9 + -2n = -21 + -9

Combine like terms: 9 + -9 = 0
0 + -2n = -21 + -9
-2n = -21 + -9

Combine like terms: -21 + -9 = -30
-2n = -30

Divide each side by '-2'.
n = 15

Simplifying
n = 15

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