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(x-1)(4x^3+4x^2-11x-6) = 0
(x-1)(x+2)(2x-3)(2x+1) = 0
akar-akar rational yg bulat hnya dipenuhi oleh
x - 1 = 0
x = 1
atau
x+2 = 0
x = -2
so, ada 2 yakni {-2,1}