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4/5x+5/8x=
= 32/40x + 25/40x = 57/40x = 1 17/40x
b)
1,2x+2/3x= 1 1/5x + 2/3x = 1 3/15x + 10/15x = 3 13/15x
c)
1/4x+5/6x-1/2x= 3/12x + 10/12x - 6/12x = 13/12x - 6/12x = 7/12x
d)
3/7x-0,2x+x= 3/7x - 1/5x + x = 15/35x - 7/35x + x = 8/35x + x = 1 8/35x