if 5x-1/5x=7 find the value of 125x cube +1/125xcube
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(5x)cube+1/(5x)cube
=(-1/6)cube+(1/-1/6)cube
=-1/216-216
=-466567/216
=(-1/6)cube+(1/-1/6)cube
=-1/216-216
=-466567/216
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