\(\dfrac 2 3 x - 4 = \dfrac 2 5\\ \text{the least common multiple of the two denominators is }\\ lcm(3,5)=15\\ \text{so multiply both sides by 15}\\ 10x -60 = 6\)
\(\dfrac 2 3 x - 4 = \dfrac 2 5\\ \text{the least common multiple of the two denominators is }\\ lcm(3,5)=15\\ \text{so multiply both sides by 15}\\ 10x -60 = 6\)