-6a+18-12a-30-3a+6=0

Solution for -6a+18-12a-30-3a+6=0 equation:

Simplifying
-6a + 18 + -12a + -30 + -3a + 6 = 0

Reorder the terms:
18 + -30 + 6 + -6a + -12a + -3a = 0

Combine like terms: 18 + -30 = -12
-12 + 6 + -6a + -12a + -3a = 0

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

Combine like terms: -6a + -12a = -18a
-6 + -18a + -3a = 0

Combine like terms: -18a + -3a = -21a
-6 + -21a = 0

Solving
-6 + -21a = 0

Solving for variable 'a'.

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

Add '6' to each side of the equation.
-6 + 6 + -21a = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -21a = 0 + 6
-21a = 0 + 6

Combine like terms: 0 + 6 = 6
-21a = 6

Divide each side by '-21'.
a = -0.2857142857

Simplifying
a = -0.2857142857