(-7b+4a)+(-6a-9b)=

Solution for (-7b+4a)+(-6a-9b)= equation:

Simplifying
(-7b + 4a) + (-6a + -9b) = 0

Reorder the terms:
(4a + -7b) + (-6a + -9b) = 0

Remove parenthesis around (4a + -7b)
4a + -7b + (-6a + -9b) = 0

Remove parenthesis around (-6a + -9b)
4a + -7b + -6a + -9b = 0

Reorder the terms:
4a + -6a + -7b + -9b = 0

Combine like terms: 4a + -6a = -2a
-2a + -7b + -9b = 0

Combine like terms: -7b + -9b = -16b
-2a + -16b = 0

Solving
-2a + -16b = 0

Solving for variable 'a'.

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

Add '16b' to each side of the equation.
-2a + -16b + 16b = 0 + 16b

Combine like terms: -16b + 16b = 0
-2a + 0 = 0 + 16b
-2a = 0 + 16b
Remove the zero:
-2a = 16b

Divide each side by '-2'.
a = -8b

Simplifying
a = -8b