3a-9=6a+15

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Solution for 3a-9=6a+15 equation:


Simplifying
3a + -9 = 6a + 15

Reorder the terms:
-9 + 3a = 6a + 15

Reorder the terms:
-9 + 3a = 15 + 6a

Solving
-9 + 3a = 15 + 6a

Solving for variable 'a'.

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

Add '-6a' to each side of the equation.
-9 + 3a + -6a = 15 + 6a + -6a

Combine like terms: 3a + -6a = -3a
-9 + -3a = 15 + 6a + -6a

Combine like terms: 6a + -6a = 0
-9 + -3a = 15 + 0
-9 + -3a = 15

Add '9' to each side of the equation.
-9 + 9 + -3a = 15 + 9

Combine like terms: -9 + 9 = 0
0 + -3a = 15 + 9
-3a = 15 + 9

Combine like terms: 15 + 9 = 24
-3a = 24

Divide each side by '-3'.
a = -8

Simplifying
a = -8

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