First, consider the case where 4 - x < 0, or x > 4 . Justify each step. Hint: The solution must satisfy both x<3 {and x < 4 .
x / 4-x < 3
a. (4-x) x / 4-x < (4-x)3
b. x<12-3x
c. 4x<12
d. x<3