Răspuns :
a) 18a + 15a = 33a
32b -17b = 15b
54c - c = 53c
d + 80d = 81d
b) 38x+12x+7 = 50x +7
60 + 25y - 14y = 60 + 11y
8z -8 + 5z = 13z -8
5m + 2n - 3m + 5n = 2m + 7n
a) 18a+15a=33a
32b-17b=15b
54c-c=53c
d+80d=81d
b) 38x+12x+7=50x+7
60+25y-14y= 60+11y
8z-8+5z=13z-8
5m+2n-3m+5n=2m+7n