9a-2(4a+5)=

Solution for 9a-2(4a+5)= equation:

Simplifying
9a + -2(4a + 5) = 0

Reorder the terms:
9a + -2(5 + 4a) = 0
9a + (5 * -2 + 4a * -2) = 0
9a + (-10 + -8a) = 0

Reorder the terms:
-10 + 9a + -8a = 0

Combine like terms: 9a + -8a = 1a
-10 + 1a = 0

Solving
-10 + 1a = 0

Solving for variable 'a'.

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

Add '10' to each side of the equation.
-10 + 10 + 1a = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 1a = 0 + 10
1a = 0 + 10

Combine like terms: 0 + 10 = 10
1a = 10

Divide each side by '1'.
a = 10

Simplifying
a = 10