У+56-4=123+5х+142

The given equation is: у + 56 - 4 = 123 + 5х + 142.

To solve this equation, we need to simplify both sides and isolate the variable.

On the left side of the equation, у + 56 - 4 can be simplified to у + 52.

On the right side of the equation, 123 + 5х + 142 can be simplified to 265 + 5х.

Now we have the simplified equation: у + 52 = 265 + 5х.

To isolate the variable, we need to get rid of the constant term on the left side. We can do this by subtracting 52 from both sides of the equation:

у + 52 - 52 = 265 + 5х - 52

This simplifies to: у = 213 + 5х.

Therefore, the solution to the equation is у = 213 + 5х.