using direct method so that p: if x is a real numbers such that x cube + 4 x = 20 then X is zero is true
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xcube+4x=20
x×x×x = 20-4x
x×x×x÷x=16
x square=16
x=4
x×x×x = 20-4x
x×x×x÷x=16
x square=16
x=4
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