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3x + 4= 2 (x- x) then x =...

3x + 4= 2 (x- x) then x = _______

A

`4/3`

B

`-4/3`

C

3

D

`-4`

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A : the equation whose roots are multiplied by 2 of those of x^(5) - 2x^(4) + 3x^(3) - 2x^(2) + 4x + 3 =0 is x^(5) - 4x^(4) + 12x^(3) - 16x^(2) + 64x + 96 = 0 . R: the equation whose roots are multiplied by k of those of f(x) = 0 is f(x/k) = 0.