-4*-25=a

Solution for -4*-25=a equation:

Simplifying
-4 * -25 = a

Multiply -4 * -25
100 = a

Solving
100 = 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.
100 + -1a = a + -1a

Combine like terms: a + -1a = 0
100 + -1a = 0

Add '-100' to each side of the equation.
100 + -100 + -1a = 0 + -100

Combine like terms: 100 + -100 = 0
0 + -1a = 0 + -100
-1a = 0 + -100

Combine like terms: 0 + -100 = -100
-1a = -100

Divide each side by '-1'.
a = 100

Simplifying
a = 100