X/2=25/5
x/2=5
x=10
8/X=4/3
x=3*8/4=6
18X/5=X/5
X/6=2 x=12
1/7=3/X
x=3*7=21
7+x/3 ????
0,2/0,3=x/9
2/3=x/9
x=9*2/3=6
0,(5)/0,(3)=x/15
(5/9 ) /(3/9) =x/15
5/9 * 9/3 =x/15
5/3=x/15
x=5*15/3=25
2/3/6=4/x
2/18=4/x
x=4*18/2=36
(1/5) /(1/7)=x/10
1/5 *7/1=x/10
7/5=x/10
x=7*10/5=14