1.
1/9=x+3/27
27 * 1 = 9 * (x+3)
27 = 9x + 27
27 - 27 = 9x
9x = 0
x = 0 czyli ODP: C
2.
1/9 = x-3/27
27*1 = 9 * (x-3)
27 = 9x - 27
27 + 27 = 9x
9x = 54
x = 6 czyli ODP: D
3.
4/3 = 3x+2/6
6*4 = 3 * (3x+2)
24 = 9x + 6
24 - 6 = 9x
9x = 18
x = 2 czyli ODP: A