1) 8,1/5,4 = 1,5 = (5x+6)/541,5 * 54 = 5x + 681 = 5x + 65x = 75x = 15
2) 0,7/1,05 = 0,66667 = (x-2)/10,50,66667 * 10,5 = x - 27 = x - 2x = 9
3) 7x+5/16 = 4/1,6(7x+5)/16 = 2,57x + 5 = 407x = 35x = 5.
1) 8,1/5,4 = 1,5 = (5x+6)/54
1,5 * 54 = 5x + 6
81 = 5x + 6
5x = 75
x = 15
2) 0,7/1,05 = 0,66667 = (x-2)/10,5
0,66667 * 10,5 = x - 2
7 = x - 2
x = 9
3) 7x+5/16 = 4/1,6
(7x+5)/16 = 2,5
7x + 5 = 40
7x = 35
x = 5.