5a+6-a-15=

Solution for 5a+6-a-15= equation:

Simplifying
5a + 6 + -1a + -15 = 0

Reorder the terms:
6 + -15 + 5a + -1a = 0

Combine like terms: 6 + -15 = -9
-9 + 5a + -1a = 0

Combine like terms: 5a + -1a = 4a
-9 + 4a = 0

Solving
-9 + 4a = 0

Solving for variable 'a'.

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

Add '9' to each side of the equation.
-9 + 9 + 4a = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 4a = 0 + 9
4a = 0 + 9

Combine like terms: 0 + 9 = 9
4a = 9

Divide each side by '4'.
a = 2.25

Simplifying
a = 2.25