-9a-1=15+3a

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Solution for -9a-1=15+3a equation:


Simplifying
-9a + -1 = 15 + 3a

Reorder the terms:
-1 + -9a = 15 + 3a

Solving
-1 + -9a = 15 + 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.
-1 + -9a + -3a = 15 + 3a + -3a

Combine like terms: -9a + -3a = -12a
-1 + -12a = 15 + 3a + -3a

Combine like terms: 3a + -3a = 0
-1 + -12a = 15 + 0
-1 + -12a = 15

Add '1' to each side of the equation.
-1 + 1 + -12a = 15 + 1

Combine like terms: -1 + 1 = 0
0 + -12a = 15 + 1
-12a = 15 + 1

Combine like terms: 15 + 1 = 16
-12a = 16

Divide each side by '-12'.
a = -1.333333333

Simplifying
a = -1.333333333

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