(x+1)(x+2)(x+3)(x+6)-3x
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It's very easy!
See, (x+1)(x+2)(x+3)(x+6)-3x
=> (x2 + 2x + x + 2)(x2 + 6x + 3x + 18) - 3x
=> (x2 + 3x + 2)(x2 + 9x + 18) - 3x
=> x4+9x3+18x2+3x3+27x2+54x+2x2+18x+36-3x
=> x4 + 12x3 + 47x2 + 69x + 36 (ans)
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