9x^2-4=0
2x^2=3x
2=7x^2+2
(2x+1)(x-4)=(x-2)(x+2)
9x^2-4=0
9x^2 = 4 /:9
x^2 = 4/9
x= ± 2/3
2x^2=3x
2x^2 -3x = 0
x (2x - 3) = 0
x= 0 либо x = 1,5
2=7x^2+2
7x^2 = 0 /:7
x^2 = 0
x= 0
(2x+1)(x-4)=(x-2)(x+2)
2x^2-7x - 4 = x^2 - 4
x^2 - 7x = 0
x (x - 7 ) = 0
x=0 либо x = 7
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