-85-(-42)=z

Solution for -85-(-42)=z equation:

Simplifying
-85 + -1(-42) = z

Multiply -1 * -42
-85 + 42 = z

Combine like terms: -85 + 42 = -43
-43 = z

Solving
-43 = z

Solving for variable 'z'.

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

Add '-1z' to each side of the equation.
-43 + -1z = z + -1z

Combine like terms: z + -1z = 0
-43 + -1z = 0

Add '43' to each side of the equation.
-43 + 43 + -1z = 0 + 43

Combine like terms: -43 + 43 = 0
0 + -1z = 0 + 43
-1z = 0 + 43

Combine like terms: 0 + 43 = 43
-1z = 43

Divide each side by '-1'.
z = -43

Simplifying
z = -43