How would i solve this please. 20 + 25 + 50(x - 2) = C

Arianna paid a total of $145 to check all her bags on a flight. How many bags did she check in all?

Question

How would i solve this please. 20 + 25 + 50(x - 2) = C

Arianna paid a total of $145 to check all her bags on a flight. How many bags did she check in all?

anonymous · Answer

20+25+50x-100=145                parenthesis first 
                   +100=+100              add 100 to both sides
20+25+50x=245          
45+50x=245
-45         -45                  subtract 45 from each side
50x=200   
---   ---                      divide by 50
50     50
x=4