In this case the answer is very simple. .
We need to apply algebraic rules to solve the expression.
(2x + 1) - (x + 3/2)
2x + 1 - x - 3/2
[tex]2x\text{ - x + 1 - }\frac{3}{2}\text{ = x + }\frac{2-3}{2}\text{ = x -}\frac{1}{2}[/tex]The solution is:
B: x - 1/2