Evaluate dfrac 15r-1 and 8203r and 8203 and 820315 and 8203 and 8203 and minus1start fraction 15 divided by r end fraction minus 1 when r5r5r equals 5.?

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Evaluate dfrac 15r-1 and 8203r and 8203 and 820315 and 8203 and 8203 and minus1start fraction 15 divided by r end fraction minus 1 when r5r5r equals 5.?