(3a-b)-(6a+6b)=

Solution for (3a-b)-(6a+6b)= equation:

Simplifying
(3a + -1b) + -1(6a + 6b) = 0

Remove parenthesis around (3a + -1b)
3a + -1b + -1(6a + 6b) = 0
3a + -1b + (6a * -1 + 6b * -1) = 0
3a + -1b + (-6a + -6b) = 0

Reorder the terms:
3a + -6a + -1b + -6b = 0

Combine like terms: 3a + -6a = -3a
-3a + -1b + -6b = 0

Combine like terms: -1b + -6b = -7b
-3a + -7b = 0

Solving
-3a + -7b = 0

Solving for variable 'a'.

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

Add '7b' to each side of the equation.
-3a + -7b + 7b = 0 + 7b

Combine like terms: -7b + 7b = 0
-3a + 0 = 0 + 7b
-3a = 0 + 7b
Remove the zero:
-3a = 7b

Divide each side by '-3'.
a = -2.333333333b

Simplifying
a = -2.333333333b