3a+21=a-8

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Solution for 3a+21=a-8 equation:


Simplifying
3a + 21 = a + -8

Reorder the terms:
21 + 3a = a + -8

Reorder the terms:
21 + 3a = -8 + a

Solving
21 + 3a = -8 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
21 + 3a + -1a = -8 + a + -1a

Combine like terms: 3a + -1a = 2a
21 + 2a = -8 + a + -1a

Combine like terms: a + -1a = 0
21 + 2a = -8 + 0
21 + 2a = -8

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

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

Combine like terms: -8 + -21 = -29
2a = -29

Divide each side by '2'.
a = -14.5

Simplifying
a = -14.5

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