6=-3(a-1)

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

Simplifying
6 = -3(a + -1)

Reorder the terms:
6 = -3(-1 + a)
6 = (-1 * -3 + a * -3)
6 = (3 + -3a)

Solving
6 = 3 + -3a

Solving for variable 'a'.

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

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

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

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

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

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

Divide each side by '3'.
a = -1

Simplifying
a = -1