72=1(2-9a)

Solution for 72=1(2-9a) equation:

Simplifying
72 = 1(2 + -9a)
72 = (2 * 1 + -9a * 1)
72 = (2 + -9a)

Solving
72 = 2 + -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.
72 + 9a = 2 + -9a + 9a

Combine like terms: -9a + 9a = 0
72 + 9a = 2 + 0
72 + 9a = 2

Add '-72' to each side of the equation.
72 + -72 + 9a = 2 + -72

Combine like terms: 72 + -72 = 0
0 + 9a = 2 + -72
9a = 2 + -72

Combine like terms: 2 + -72 = -70
9a = -70

Divide each side by '9'.
a = -7.777777778

Simplifying
a = -7.777777778