y*7=28-28

To solve the equation \( y \cdot 7 = 28 - 28 \), first simplify the right side:

\[ 28 - 28 = 0 \]

So, the equation simplifies to:

\[ y \cdot 7 = 0 \]

Next, divide both sides by 7:

\[ y = \frac{0}{7} = 0 \]

Therefore, the solution is:

\[ y = 0 \]