9/5=6,3x/7
6,3x * 5 = 9 * 7
31,5x = 63
x = 63 : 31,5
x = 2
3,4/9=17x/4,5
17x * 9 = 4,5 * 3,4
153x = 15,3
x = 15,3 : 153
x = 0,1
1,5x/4=9/8
1,5x * 8 = 9 * 4
12x = 36
x = 36 : 12
x = 3
