Answer :
5(b - 4) + 25 = (5 × 6) - (5 × 4)
5(b) - 5(4) + 25 = 30 - 20
5b - 20 + 25 = 10
5b + 5 = 10
-5 -5
5b = 5
5 5
b = 1
5(b) - 5(4) + 25 = 30 - 20
5b - 20 + 25 = 10
5b + 5 = 10
-5 -5
5b = 5
5 5
b = 1