Comparison of Algebraic Expressions

Let $x$ be a real number. Consider the equation:

$$3x - 4 = 2(x + 1)$$

Simplify the equation and determine the value of $x$. After finding the value of $x$, evaluate the following expressions:

Quantity A: $4x\; +\; 3$

Quantity B: $2x\; +\; 15$

Based on your calculations, determine the relationship between Quantity A and Quantity B.