7y-1=55 it is right or wrong

7y=56

7y/7=56/7

y=8

I am pretty sure you mean by if you can solve the problem

so it is right

Since - 1 does not contain the variable to solve for, move it to the right-hand side of the equation by adding 1 to both sides.

7y=1+55

Add 1 and 55 to get 56.

7y=56

Divide each term in the equation by 7.

y = 8