1) 4x + 23/5,4 = 8,5/1,7
4x + 23/5,4 = 5
4x = 5 - 23/5,4
4x = 5 - 4,259
4x = 0,741
x = 0,741 / 4
x = 0,18525

2) 5/12 = 3/1,3x + 2
3/1,3x = 5/12 - 2
3/1,3x = 5/12 - 24/12
3/1,3x = -19/12
x = -19/12 * 1,3/3
x = -19/36

3) 15/27 = 9/8x + 4,2
9/8x = 15/27 - 4,2
9/8x = 5/9 - 37,8/9
9/8x = -32,8/9
x = -32,8/9 * 8/9
x = -262,4/81

4) 6/5 = 3x + 1,5/9
3x = 6/5 - 1,5/9
3x = 54/45 - 8,3/45
3x = 45,7/45
x = 45,7/45 * 1/3
x = 15,23/15

5) 1,4/2x + 1 = 4,6/23
1,4/2x = 4,6/23 - 1
1,4/2x = 4,6/23 - 1 23/23
1,4/2x = 4,6 - 23/23
1,4/2x = 3,6
x = 3,6 2/1,4
x = 5

6) 5x - 0,8/16 = 3,4/17
5x = 3,4/17 + 0,8/16
5x = 3,4/17 + 1/2
5x = 3,4/17 + 8,5/17
5x = 11,9/17
x = 11,9/17 * 1/5
x = 2.38/17