-3(4a-20)=0

Solution for -3(4a-20)=0 equation:

Simplifying
-3(4a + -20) = 0

Reorder the terms:
-3(-20 + 4a) = 0
(-20 * -3 + 4a * -3) = 0
(60 + -12a) = 0

Solving
60 + -12a = 0

Solving for variable 'a'.

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

Add '-60' to each side of the equation.
60 + -60 + -12a = 0 + -60

Combine like terms: 60 + -60 = 0
0 + -12a = 0 + -60
-12a = 0 + -60

Combine like terms: 0 + -60 = -60
-12a = -60

Divide each side by '-12'.
a = 5

Simplifying
a = 5