6-3(a+13)=4

Solution for 6-3(a+13)=4 equation:

Simplifying
6 + -3(a + 13) = 4

Reorder the terms:
6 + -3(13 + a) = 4
6 + (13 * -3 + a * -3) = 4
6 + (-39 + -3a) = 4

Combine like terms: 6 + -39 = -33
-33 + -3a = 4

Solving
-33 + -3a = 4

Solving for variable 'a'.

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

Add '33' to each side of the equation.
-33 + 33 + -3a = 4 + 33

Combine like terms: -33 + 33 = 0
0 + -3a = 4 + 33
-3a = 4 + 33

Combine like terms: 4 + 33 = 37
-3a = 37

Divide each side by '-3'.
a = -12.33333333

Simplifying
a = -12.33333333