Jeff bought 3 bags of dog food. he also bought a set of new dog bowls that cost eighteen dollars . he spent a total of forty-five dollars. write both the verbal and mathematical equation to find out how much jeff paid for each bag of dog food.

[3 + 18x = 45  ]                
-3               -3
  3 was the constant so we cancel the three by changing  to the opposite . Then subtract the -3 from 45 which equals 42.  After subtract 3 , you divide by  the number that has a variable   x is the variable
=18 divide by 42
x=21