3x² - 4x = 0 can be simplified to x(3x - 4) = 0
Set both the inside and outside of the parenthesis individually equal to zero.
x = 0
3x - 4 = 0
The first equation is done. The second one, add 4 to both sides to get constants on one side and variables on the other.
3x = 0 + 4
3x = 4
Divide by 3 on both sides to isolate the variable X
x = 4/3
Your final answer is x = 0, 4/3