tìm `a in NN` tm: `[sqrt(a^2 + a + 1) + asqrt(a + 1)] + [sqrt([sqrt(a^2 + a)])] = 15`

tìm `a in NN` tm: `[sqrt(a^2 + a + 1) + asqrt(a + 1)] + [sqrt([sqrt(a^2 + a)])] = 15`
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