1. The problem is to find the value of $z_1 + z_2 - z_3$ given $z_1 = 2 + j3$. 2. However, the values of $z_2$ and $z_3$ are not provided in the problem statement. 3. To solve this, we need the values of $z_2$ and $z_3$. 4. Once $z_2$ and $z_3$ are known, we can add $z_1$ and $z_2$ by adding their real parts and imaginary parts separately, then subtract $z_3$ similarly. 5. For example, if $z_2 = a + jb$ and $z_3 = c + jd$, then: $$z_1 + z_2 - z_3 = (2 + a - c) + j(3 + b - d)$$ 6. Please provide the values of $z_2$ and $z_3$ to proceed with the calculation.