-3a+21+8a=2a-4a

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Solution for -3a+21+8a=2a-4a equation:


Simplifying
-3a + 21 + 8a = 2a + -4a

Reorder the terms:
21 + -3a + 8a = 2a + -4a

Combine like terms: -3a + 8a = 5a
21 + 5a = 2a + -4a

Combine like terms: 2a + -4a = -2a
21 + 5a = -2a

Solving
21 + 5a = -2a

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
21 + 5a + 2a = -2a + 2a

Combine like terms: 5a + 2a = 7a
21 + 7a = -2a + 2a

Combine like terms: -2a + 2a = 0
21 + 7a = 0

Add '-21' to each side of the equation.
21 + -21 + 7a = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 7a = 0 + -21
7a = 0 + -21

Combine like terms: 0 + -21 = -21
7a = -21

Divide each side by '7'.
a = -3

Simplifying
a = -3

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