X - 3= -21
This is so confusing:(

Step-by-step explanation:

In order to solve this, we are trying to find the value of . Basically, is a placeholder for a number that is unknown. Some number minus 3 is equal to 21.

Our goal is to find . To do this we want to isolate on one side of the equation

Let's add 3 to both sides.

Hope this helped!

x = -18

Step-by-step explanation:

x - 3 = -21

add 3 to both sides

x - 3 + 3 = -21 + 3

x = -18

sidenote: you can add anything to both sides of an equation, and it'll still be true. for example, 2 = 2, if you add 1 to both sides you get 3=3 which is still true.

there are 70 more legs than eyes at the dog show (196 – 126 = 70). dogs have two more legs than eyes, and humans have the same number of legs as eyes. thus 70 is twice the number of dogs at the show, so the number of dogs is half of 70, which is 35. to get the number of humans, subtract 35 from 63: 63 – 35 = 28.

step-by-step explanation: