Reason step by step using the strategies described above.  
Solve this sequence:

banana + banana = 30, 
(cherry + cherry) + (cherry + cherry) = 20 ,
apple + apple = 8, 
banana + cherry * apple = x

1. first substitute letters for the fruit instead (i.e. B = banana)
2. solve each equation
3. Use the solutions for each value to solve for x in the final equation 

Solve for x.