4. Solve for   x.

3(x - 3) - x < x - 1

Remove parentheses

3x - 9 - x < x - 1

Combine like terms

2x - 9 < x - 1

One can transpose terms in an inequality just like in an equation.

Transpose   x   terms to one side and unknown terms to the other.

2x - x < 9 - 1

Combine

x < 8