4a+5a-2(2a+3)=0

Solution for 4a+5a-2(2a+3)=0 equation:

Simplifying
4a + 5a + -2(2a + 3) = 0

Reorder the terms:
4a + 5a + -2(3 + 2a) = 0
4a + 5a + (3 * -2 + 2a * -2) = 0
4a + 5a + (-6 + -4a) = 0

Reorder the terms:
-6 + 4a + 5a + -4a = 0

Combine like terms: 4a + 5a = 9a
-6 + 9a + -4a = 0

Combine like terms: 9a + -4a = 5a
-6 + 5a = 0

Solving
-6 + 5a = 0

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 + 5a = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 5a = 0 + 6
5a = 0 + 6

Combine like terms: 0 + 6 = 6
5a = 6

Divide each side by '5'.
a = 1.2

Simplifying
a = 1.2