To solve for Y, we will first simplify the left side of the equation:

(125/13 + Y) - 99/13 = 7*7/13
(60/13 + Y) - 81/13 = 49/13

Next, we combine the constants on the left side of the equation:
60/13 - 81/13 = -21/13

So now we have:
-21/13 + Y = 49/13

To solve for Y, we isolate Y on one side of the equation by adding 21/13 to both sides:
Y = 49/13 + 21/13
Y = 70/13

Therefore, the solution to the equation is Y = 70/13.