To solve the equation $2.5 - 2.5y = 5$ for $y$, follow these steps:

Step 1: Subtract 2.5 from both sides.

$2.5 - 2.5y - 2.5 = 5 - 2.5$ $-2.5y = 2.5$

Step 2: Divide both sides by $-2.5$.

$y = \frac{2.5}{-2.5}$ $y = -1$

Thus, the solution is $y = -1$.

Would you like more details or have any questions?

Here are 5 related questions for practice:

1. Solve for $y$: $3 - 4y = 7$.
2. Solve for $x$: $6x - 3 = 15$.
3. Solve for $z$: $5z + 12 = 32$.
4. Solve for $a$: $7 - 3a = 10a + 2$.
5. Solve for $y$: $8 - 3y = 2y + 4$.

Tip: Always try to isolate the variable on one side to simplify the equation step by step.