a)4/3x + 5/8x = (4/3+ 5/8)x= ( 32/24 + 15/24)x = 47/24x
b) 1,2x + ⅔x = (12/10 + ⅔)x= (36/30 + 20/30)x= 56/30x
c) ¼x +⅚x - ½x= (¼+⅚-½)x = (3/12+10/12-6/12)x= 7/12x
d) 3/7x - 0,2x + x = (3/7 - 2/10 + 1)x= (30/70-14/70 + 1)x = 1 16/70x
