Question 903989
B the Other Side 
P = (2x+3y-1) + (2x+3y-1) + B
Question States***
(2x+3y-1) + (2x+3y-1) + B = 7x + 9y
 4x + 6y - 2 + B = 7x + 9y
B = 7x + 9y - 4x - 6y +2  = 3x + 3y + 2