Answer:
![SV=5\ units](https://img.qammunity.org/2020/formulas/mathematics/middle-school/tk3k00bgfain8x1b357xo2uemoyp8h67bv.png)
Explanation:
see the attached figure to better understand the problem
we know that
In a parallelogram opposites sides are parallel and congruent
so
In this problem
---> by opposite sides
substitute the given values
![x+3=4x-3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/flyex72b0hctzo21w3fz1f66vqjf453pct.png)
solve for x
![4x-x=3+3\\3x=6\\x=2](https://img.qammunity.org/2020/formulas/mathematics/middle-school/prdcnacc9snvjzdm79qw6esbzs9xeyiv59.png)
Find the length of SV
![SV=x+3](https://img.qammunity.org/2020/formulas/mathematics/middle-school/tmqmh9r59c4wlqmonox78lswxie70cj9z6.png)
substitute the value of x
![SV=2+3=5\ units](https://img.qammunity.org/2020/formulas/mathematics/middle-school/j4uxga78hofwc2u7rwn1e0qxqpm10bv4yb.png)