Top a + 7 equals 3 A - 11​

Pranav and molly are selling pies for a school fundraiser. customers can buy blueberry pies and pumpkin pies. pranav sold 6 blueberry pies and 4 pumpkin pies for a total of $106. molly sold 6 blueberry pies and 3 pumpkin pies for a total of $90. find the cost of each of one blueberry pie and one pumpkin pie

Your family took a road trip on saturday you were in the car for 4.5 hours and average 70 mph. how many miles did you travel?

[tex]a + (3a - 2b) - (4a - 3b)[/tex]whats the answer to this ? ?