Question

Which value for x makes the sentence true?

Answer 1

what do u think it is?

Answer 2

1/7 + x = 1/3 --- subtract 1/7 from both sides
x = 1/3 - 1/7 --- common denominator is 21
x = 7/21 - 3/21
x = 4/21

OR
1/7 + x = 1/3 --- multiply everything by 21
3 + 21x = 7
21x = 7 - 3
21x = 4
x = 4/21

either way will get you to the answer