Final answer:
The solutions to the equation are x = 0 and x = 9.
Step-by-step explanation:
To solve the equation -5x² +9x²-27x=6x +3x², we can combine like terms on both sides of the equation. 
This gives us 4x² -27x = 9x. 
Next, we can move all terms to one side of the equation to get 4x² -36x = 0. 
Now, we can factor out a common term of 4x to get 4x(x - 9) = 0. 
From here, we can set each factor equal to zero and solve for x. 
This gives us two possible solutions: x = 0 and x = 9. 
Therefore, the solutions to the equation are x = 0 and x = 9.