21+8a=-3(-a-2)

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Solution for 21+8a=-3(-a-2) equation:


Simplifying
21 + 8a = -3(-1a + -2)

Reorder the terms:
21 + 8a = -3(-2 + -1a)
21 + 8a = (-2 * -3 + -1a * -3)
21 + 8a = (6 + 3a)

Solving
21 + 8a = 6 + 3a

Solving for variable 'a'.

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

Add '-3a' to each side of the equation.
21 + 8a + -3a = 6 + 3a + -3a

Combine like terms: 8a + -3a = 5a
21 + 5a = 6 + 3a + -3a

Combine like terms: 3a + -3a = 0
21 + 5a = 6 + 0
21 + 5a = 6

Add '-21' to each side of the equation.
21 + -21 + 5a = 6 + -21

Combine like terms: 21 + -21 = 0
0 + 5a = 6 + -21
5a = 6 + -21

Combine like terms: 6 + -21 = -15
5a = -15

Divide each side by '5'.
a = -3

Simplifying
a = -3

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