a)a(18+15)=33a
b) 38x - 12x - 7= x(38-12)+7 = 26x+7
c) 32b - 17b = 15b
d) 60 + 25y-14y = 60 + y(25-14) = 60+11y
f) 54c - c = (54 - 1) = 53c
g) 8z - 8 + 5z = z ( 8+5) -8 = 13z - 8
h) d + 80d = d(1 + 80) = 81d
I) 5m + 2m - 3m + 5m = m(5-3) + n(2+5) = 2m + 7n
