-2a+21+6a=4a-7a

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Solution for -2a+21+6a=4a-7a equation:


Simplifying
-2a + 21 + 6a = 4a + -7a

Reorder the terms:
21 + -2a + 6a = 4a + -7a

Combine like terms: -2a + 6a = 4a
21 + 4a = 4a + -7a

Combine like terms: 4a + -7a = -3a
21 + 4a = -3a

Solving
21 + 4a = -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 + 4a + 3a = -3a + 3a

Combine like terms: 4a + 3a = 7a
21 + 7a = -3a + 3a

Combine like terms: -3a + 3a = 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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