The difference of five and five y is the same as eight and two y

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The difference of five and five y
5 - 5y

eight and two y
8 + 2y

The phrase is the same as means equal to. Set 5 - 5y equal to 8 + 2y for our final algebraic expression
5 - 5y = 8 + 2y

If the problem asks you to solve for y:

Add 5y to each side:
5 = 8 + 7y

Subtract 8 from each side:
7y = -3

Divide each side by 7:
y= -3/7