2n+21=8a-9

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Solution for 2n+21=8a-9 equation:


Simplifying
2n + 21 = 8a + -9

Reorder the terms:
21 + 2n = 8a + -9

Reorder the terms:
21 + 2n = -9 + 8a

Solving
21 + 2n = -9 + 8a

Solving for variable 'n'.

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

Add '-21' to each side of the equation.
21 + -21 + 2n = -9 + -21 + 8a

Combine like terms: 21 + -21 = 0
0 + 2n = -9 + -21 + 8a
2n = -9 + -21 + 8a

Combine like terms: -9 + -21 = -30
2n = -30 + 8a

Divide each side by '2'.
n = -15 + 4a

Simplifying
n = -15 + 4a

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