-1=a-(-85)

Solution for -1=a-(-85) equation:

Simplifying
-1 = a + -1(-85)

Multiply -1 * -85
-1 = a + 85

Reorder the terms:
-1 = 85 + a

Solving
-1 = 85 + 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.
-1 + -1a = 85 + a + -1a

Combine like terms: a + -1a = 0
-1 + -1a = 85 + 0
-1 + -1a = 85

Add '1' to each side of the equation.
-1 + 1 + -1a = 85 + 1

Combine like terms: -1 + 1 = 0
0 + -1a = 85 + 1
-1a = 85 + 1

Combine like terms: 85 + 1 = 86
-1a = 86

Divide each side by '-1'.
a = -86

Simplifying
a = -86