Question

The sum of twice a number and 42 is 126 what is the number

Answer 1

Let n = number

2n + 42 = 126
2n = 84
n = 42

Your number is 42. 

Answer 2

2x+42=126
2x=126-42
2x= 84
x= 84/2
x=42

Number should be 42.