Răspuns :
2a + 5/9 = 2*1/3
2a + 5/9 = 7/3 / x9
18a + 5 = 21
18a = 21 - 5
18a = 16
a = 16/18 = 8/9
2a + 5/9 = 7/3 / x9
18a + 5 = 21
18a = 21 - 5
18a = 16
a = 16/18 = 8/9
2x + 5/9 = 2x1/3
2x + 5/9 = 7/3
18x + 5 = 21
18x = 21 - 5
18x = 16
9x = 8
x = 8/9
2x + 5/9 = 7/3
18x + 5 = 21
18x = 21 - 5
18x = 16
9x = 8
x = 8/9