x+0,(6)=1,3
x + 6/9 = 13/10 /×90
90x + 60 = 117
90x = 117 - 60
90x = 57
x = 57/90
x = 0,6(3)
x+0,(6)=1,3, x=0,(6)-1,3=2/3-13/10=(20-39)/30=-19/30=0,6(3)
