Step 1. Add 3 to both sides. You will get an equivalent equation
2y = -5 + 3, or 2y = -2.
Step 2. In the last equation, divide both sides by 2. You will get an equivalent equation
y = , or y = -1.
It is your solution: y = -1.
Answer. y = -1.
Solved.
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As I see, you have problems with solving simplest linear equations.
For the people who want to learn the procedure on how to solve such equations, there is a lesson in this site
- HOW TO solve a linear equation