Find an equivalent equation to -3x-5=16 by adding five to each side. * -3x = 21
-3x = 11
-3x = 16
-3x - 10 = 21
-3x - 10 = 11
-3x - 10 = 16
-3x + 10 = 21
-3x + 10 = 11
-3x + 10 = 16

-3x = 21
Explanation: on the -3x-5 side, add 5 to -5. That cancels it out so you are left with -3x. On the 16 side, add 5. 16+5 is 21. Therefore, -3x = 21 is equivalent to -3x-5 = 16.

Also:
If you are also supposed to solve the equation the answer is x = -7.

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.