-1*4=a

Solution for -1*4=a equation:

Simplifying
-1 * 4 = a

Multiply -1 * 4
-4 = a

Solving
-4 = 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.
-4 + -1a = a + -1a

Combine like terms: a + -1a = 0
-4 + -1a = 0

Add '4' to each side of the equation.
-4 + 4 + -1a = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1a = 0 + 4
-1a = 0 + 4

Combine like terms: 0 + 4 = 4
-1a = 4

Divide each side by '-1'.
a = -4

Simplifying
a = -4