=-5a-7b+a-5b-4-(-a)

Solution for =-5a-7b+a-5b-4-(-a) equation:

Simplifying
0 = -5a + -7b + a + -5b + -4 + -1(-1a)

Remove parenthesis around (-1a)
0 = -5a + -7b + a + -5b + -4 + -1 * -1a

Multiply -1 * -1
0 = -5a + -7b + a + -5b + -4 + 1a

Reorder the terms:
0 = -4 + -5a + a + 1a + -7b + -5b

Combine like terms: -5a + a = -4a
0 = -4 + -4a + 1a + -7b + -5b

Combine like terms: -4a + 1a = -3a
0 = -4 + -3a + -7b + -5b

Combine like terms: -7b + -5b = -12b
0 = -4 + -3a + -12b

Solving
0 = -4 + -3a + -12b

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
0 + 3a = -4 + -3a + 3a + -12b
Remove the zero:
3a = -4 + -3a + 3a + -12b

Combine like terms: -3a + 3a = 0
3a = -4 + 0 + -12b
3a = -4 + -12b

Divide each side by '3'.
a = -1.333333333 + -4b

Simplifying
a = -1.333333333 + -4b