-8*9=a

Solution for -8*9=a equation:

Simplifying
-8 * 9 = a

Multiply -8 * 9
-72 = a

Solving
-72 = a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-72 + -1a = a + -1a

Combine like terms: a + -1a = 0
-72 + -1a = 0

Add '72' to each side of the equation.
-72 + 72 + -1a = 0 + 72

Combine like terms: -72 + 72 = 0
0 + -1a = 0 + 72
-1a = 0 + 72

Combine like terms: 0 + 72 = 72
-1a = 72

Divide each side by '-1'.
a = -72

Simplifying
a = -72