17^3 - 16^3 = 1+3*17*x
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17³ - 16³ = 1+3*17*x
(17-16)=(17²+17×16+16²)=1+3×17×x
1(289+272+256)=1+51x
817=52x
817/52=x
x=15.7
Hope this helps
Thank you
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