Question

Just number 7, please help quickly I don’t know what I’m doing (if you give an explanation I’ll mark as brainliest)

Answer 1

Answer: b

Step-by-step explanation:

x=12

12+5=17

3 times 12 is 36+10=46

46+17=63

12+51=63  

They are both 63

Answer 2

Answer:

x=12

Step-by-step explanation:

x+5+3x+10=x+51

Step 1- Simplify

15+4x=x+51

Step 2- Move the variable to one side  

15+4x=x+51  

    -1x -1x

15+3x=51

Step 3- Subtract

15+3x=51

-15       -15

3x=36

Step 4- Divide

3x=36

3    3

Conclusion-- x=12