ON = LM
8x - 8 = 7x + 4
+8 +8
---------------------
8x = 7x + 12
-7x -7x
---------------------
x = 12
NM = OL
x - 5 = 3y - 6
(12) - 5 = 3y - 6
7 = 3y - 6
-7 - 7
---------------
0 = 3y - 13
-3y -3y
----------------
-3y = - 13
-3y( ÷ -3) = -13 ( ÷ -3 )
-------------------------------
__
y = 4.33