-(1+7a)-6(-7-a)=36

Solution for -(1+7a)-6(-7-a)=36 equation:

Simplifying
-1(1 + 7a) + -6(-7 + -1a) = 36
(1 * -1 + 7a * -1) + -6(-7 + -1a) = 36
(-1 + -7a) + -6(-7 + -1a) = 36
-1 + -7a + (-7 * -6 + -1a * -6) = 36
-1 + -7a + (42 + 6a) = 36

Reorder the terms:
-1 + 42 + -7a + 6a = 36

Combine like terms: -1 + 42 = 41
41 + -7a + 6a = 36

Combine like terms: -7a + 6a = -1a
41 + -1a = 36

Solving
41 + -1a = 36

Solving for variable 'a'.

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

Add '-41' to each side of the equation.
41 + -41 + -1a = 36 + -41

Combine like terms: 41 + -41 = 0
0 + -1a = 36 + -41
-1a = 36 + -41

Combine like terms: 36 + -41 = -5
-1a = -5

Divide each side by '-1'.
a = 5

Simplifying
a = 5