You can put this solution on YOUR website! You're not "distributing" correctly...
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-15(y-2)-3=-5y-11(3y+7)
distributing the -15 to each term inside the parenthesis (left):
-15y+30-3=-5y-11(3y+7)
distributing the -11 to each term inside the parenthesis (right):
-15y+30-3=-5y-33y-77
-15y+27=-28y-77
13y+27=-77
13y=-104
y = -104/13
y = -8