what did I do wrong my teacher said that hey are all integers, no fractions or decimals

solving sytems of equations by elimination
-6x - 7y= 20
-5x -8y =8
My work:
-5(-6x - 7y= 20)
6(-5x -8y =8)
30x -35y = -100
+ -30x-48y = 48
________________
-83y = -52
-83y/-83 = -52/-83
y = ????
I don't know what I did wrong, help is very much appreciated