Question 760437
-3(2s-5)-15=-3(7s+6)-5
 -6s + 15-15 = -21s - 18 - 5
Collect like terms.
Don't forget to change the sign
as you cross the =
-6s + 21s = -18 - 5 
      15s = -23
         s = -23/15
         
Hope this helps.
:-)