21-2a=a-6

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Solution for 21-2a=a-6 equation:


Simplifying
21 + -2a = a + -6

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

Solving
21 + -2a = -6 + 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 + -2a + -1a = -6 + a + -1a

Combine like terms: -2a + -1a = -3a
21 + -3a = -6 + a + -1a

Combine like terms: a + -1a = 0
21 + -3a = -6 + 0
21 + -3a = -6

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

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

Combine like terms: -6 + -21 = -27
-3a = -27

Divide each side by '-3'.
a = 9

Simplifying
a = 9

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