a)(1/5x)-1,3=1
x/5-13/10=1
x/5=1/1+13/10
x/5=(10+13)/10
x/5=23/10
10x=5·23
10x=115
x=115/10
x=11,5
b)(1/3)x+2=2/3
x/3=2/3-3
x/3=(2-3·3)/3
x/3=-7/3 ·3
x=-7
c)5-2x=-2,6
-2x=-5-2,6 ·(-1)
2x=5+2,6
x=7,6/2
x=3,8
d)3,6/x=1,2
3,6=1,2·x
12x/10=36/10 · ·10
x=36/12
x=3
e)2,3x+1,2x=7
3,5x=7
x=7/1:35/10
x=(7·10)/35
x=70/35
x=2