Помогите решить! Решите уравнение:

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1,2x - 0,5x^2 = 4x^2 - 0,8x

2x - 4,5x^2 = 0

45x^2 - 20x = 0

9x^2 - 4x = 0

x (9x - 4) = 0

x = 0

or

x = 4/9

0,6x^2 + V3x = 0

x (0,6x + V3) = 0

x = 0

or

x = - 5V3/3 (V - корень)

9x^2 - 10x = 7x^2 - 15x

2x^2 + 5x = 0

x (2x + 5) = 0

x = 0

x = - 2,5

2/3x^2 = 5x

2x^2 - 15x = 0

x (2x - 15) = 0

x = 0

x = 7,5