What are all values of rrr that satisfy the equation 5(1−r3)1−r=35\frac{5(1-r^3)}{1-r} = 351−r5(1−r3)=35?
−3-3−3
{2, −3}\{2,\,-3\}{2,−3}
{1, 2, −3}\{1,\,2,\,-3\}{1,2,−3}
222
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