6=-3(1+-3a)

Solution for 6=-3(1+-3a) equation:

Simplifying
6 = -3(1 + -3a)
6 = (1 * -3 + -3a * -3)
6 = (-3 + 9a)

Solving
6 = -3 + 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
6 + -9a = -3 + 9a + -9a

Combine like terms: 9a + -9a = 0
6 + -9a = -3 + 0
6 + -9a = -3

Add '-6' to each side of the equation.
6 + -6 + -9a = -3 + -6

Combine like terms: 6 + -6 = 0
0 + -9a = -3 + -6
-9a = -3 + -6

Combine like terms: -3 + -6 = -9
-9a = -9

Divide each side by '-9'.
a = 1

Simplifying
a = 1