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x in (-oo:+oo)
4^4-x = 1/64 // - 1/64
4^4-x-(1/64) = 0
4^4-x-1/64 = 0
16383/64-x = 0 // - 16383/64
-x = -16383/64 // * -1
x = 16383/64
x = 16383/64
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