Question

3+x=7 What does variable represent?

Answer 1

good morning here is your answer,

3+x=7

or, x= 7-3

or, x= 4

Answer 2

a variable is an unknown number by the way the answer is 4 too.

3+x=7

-3 -3

______

x = 4

subtract 3 on both sides to get x (the variable) by itself.