HALP
what is:
1/a-1 (one over a minus one)
PLUS
3/3a-1 (three over three a minus one)
EQUALS
0
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1/a-1 + 3/3a-1 = 0
????????
$$\\\frac{1}{a-1}+\frac{3}{3a-1}=0\\\\ (a-1)(3a-1)\left[\frac{1}{a-1}+\frac{3}{3a-1}\right]=0(a-1)(3a-1)\\\\ \frac{(3a-1)}{1}+\frac{3(a-1)}{1}=0\\\\ 3a-1+3a-3=0\\\\ 6a-4=0\\\\ 6a=4\\\\ a=2/3$$
