72=6(a-1)

Solution for 72=6(a-1) equation:

Simplifying
72 = 6(a + -1)

Reorder the terms:
72 = 6(-1 + a)
72 = (-1 * 6 + a * 6)
72 = (-6 + 6a)

Solving
72 = -6 + 6a

Solving for variable 'a'.

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

Add '-6a' to each side of the equation.
72 + -6a = -6 + 6a + -6a

Combine like terms: 6a + -6a = 0
72 + -6a = -6 + 0
72 + -6a = -6

Add '-72' to each side of the equation.
72 + -72 + -6a = -6 + -72

Combine like terms: 72 + -72 = 0
0 + -6a = -6 + -72
-6a = -6 + -72

Combine like terms: -6 + -72 = -78
-6a = -78

Divide each side by '-6'.
a = 13

Simplifying
a = 13