The answer for this will be 105/-2 or as a decimal known as -52.5
Multiply both sides of the equation by 10, the least common multiple of 5, 2
-2x - 25 = 80
Add 25 to both sides
-2x = 80 + 25
Add 80 and 25 to get 105
-2x = 105
Divide both sides by -2 and you will find the solution 105/-2 hope this helps