1.5a+6+9a=12

Solution for 1.5a+6+9a=12 equation:

Simplifying
1.5a + 6 + 9a = 12

Reorder the terms:
6 + 1.5a + 9a = 12

Combine like terms: 1.5a + 9a = 10.5a
6 + 10.5a = 12

Solving
6 + 10.5a = 12

Solving for variable 'a'.

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

Add '-6' to each side of the equation.
6 + -6 + 10.5a = 12 + -6

Combine like terms: 6 + -6 = 0
0 + 10.5a = 12 + -6
10.5a = 12 + -6

Combine like terms: 12 + -6 = 6
10.5a = 6

Divide each side by '10.5'.
a = 0.5714285714

Simplifying
a = 0.5714285714