2a+21=-8a-9

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


Simplifying
2a + 21 = -8a + -9

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

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

Solving
21 + 2a = -9 + -8a

Solving for variable 'a'.

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

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

Combine like terms: 2a + 8a = 10a
21 + 10a = -9 + -8a + 8a

Combine like terms: -8a + 8a = 0
21 + 10a = -9 + 0
21 + 10a = -9

Add '-21' to each side of the equation.
21 + -21 + 10a = -9 + -21

Combine like terms: 21 + -21 = 0
0 + 10a = -9 + -21
10a = -9 + -21

Combine like terms: -9 + -21 = -30
10a = -30

Divide each side by '10'.
a = -3

Simplifying
a = -3

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