you multiply 8 and 15 and add to 1.53333333333 which equals 23. A simple algebretic equasion of x times 15+y=23. do opposite of operations and subtract 23 and 15 which will give you 8. Then you divide 15 into 23 and get 1.53333333333 put it together and get x=8 and y=1.53333333333. (I worked it out on a napkin!)
23
+25 and -2
-11
141
4 and 11.
-5 and -10
65
13
63
-273
60 AND 15
399