6a-9=3a-21

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Solution for 6a-9=3a-21 equation:


Simplifying
6a + -9 = 3a + -21

Reorder the terms:
-9 + 6a = 3a + -21

Reorder the terms:
-9 + 6a = -21 + 3a

Solving
-9 + 6a = -21 + 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.
-9 + 6a + -3a = -21 + 3a + -3a

Combine like terms: 6a + -3a = 3a
-9 + 3a = -21 + 3a + -3a

Combine like terms: 3a + -3a = 0
-9 + 3a = -21 + 0
-9 + 3a = -21

Add '9' to each side of the equation.
-9 + 9 + 3a = -21 + 9

Combine like terms: -9 + 9 = 0
0 + 3a = -21 + 9
3a = -21 + 9

Combine like terms: -21 + 9 = -12
3a = -12

Divide each side by '3'.
a = -4

Simplifying
a = -4

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