-6(a+56)-3(-7b-a)=

Solution for -6(a+56)-3(-7b-a)= equation:

Simplifying
-6(a + 56) + -3(-7b + -1a) = 0

Reorder the terms:
-6(56 + a) + -3(-7b + -1a) = 0
(56 * -6 + a * -6) + -3(-7b + -1a) = 0
(-336 + -6a) + -3(-7b + -1a) = 0

Reorder the terms:
-336 + -6a + -3(-1a + -7b) = 0
-336 + -6a + (-1a * -3 + -7b * -3) = 0
-336 + -6a + (3a + 21b) = 0

Combine like terms: -6a + 3a = -3a
-336 + -3a + 21b = 0

Solving
-336 + -3a + 21b = 0

Solving for variable 'a'.

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

Add '336' to each side of the equation.
-336 + -3a + 336 + 21b = 0 + 336

Reorder the terms:
-336 + 336 + -3a + 21b = 0 + 336

Combine like terms: -336 + 336 = 0
0 + -3a + 21b = 0 + 336
-3a + 21b = 0 + 336

Combine like terms: 0 + 336 = 336
-3a + 21b = 336

Add '-21b' to each side of the equation.
-3a + 21b + -21b = 336 + -21b

Combine like terms: 21b + -21b = 0
-3a + 0 = 336 + -21b
-3a = 336 + -21b

Divide each side by '-3'.
a = -112 + 7b

Simplifying
a = -112 + 7b