(2n + 1)8 + (4n + 4)9 + (6n +9)15 = (2n + 1)5 + (4n + 4)12 + (6n + 9)14
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2n+1=t 4n+4=s 6n+9=k 8t+9s+15k=5t+12s+14k 3t-3s+k=0 6n+3-12n-12+6n+9=0 0=0
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