-6a+6-6a-42-3a+6=0

Solution for -6a+6-6a-42-3a+6=0 equation:

Simplifying
-6a + 6 + -6a + -42 + -3a + 6 = 0

Reorder the terms:
6 + -42 + 6 + -6a + -6a + -3a = 0

Combine like terms: 6 + -42 = -36
-36 + 6 + -6a + -6a + -3a = 0

Combine like terms: -36 + 6 = -30
-30 + -6a + -6a + -3a = 0

Combine like terms: -6a + -6a = -12a
-30 + -12a + -3a = 0

Combine like terms: -12a + -3a = -15a
-30 + -15a = 0

Solving
-30 + -15a = 0

Solving for variable 'a'.

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

Add '30' to each side of the equation.
-30 + 30 + -15a = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -15a = 0 + 30
-15a = 0 + 30

Combine like terms: 0 + 30 = 30
-15a = 30

Divide each side by '-15'.
a = -2

Simplifying
a = -2