2x + 5 = 21, solve for x

x = 8

Step-by-step explanation:

In order to solve for x, we have to isolate the x variable

2x + 5 = 21

First, subtract 5 from both sides of the equation to isolate the 2x

2x = 16

Divide both sides by 2 to isolate the x

x = 8

We can check to makes sure that this answer is correct by plugging it back into the equation and solving.

2(8) + 5 = 21

16 + 5 = 21

21 = 21

22 and 22

step-by-step explanation:

10 plus 12 equals 22.

12 plus 10 also equals 22 because regardless of what order they're in, they're gonna equal the same thing.

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.