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1 + 2/a = 1/2 - 1/a
2/a + 1/a = 1/2 - 1
3/a = - 1/2
- a = 6
a = - 6
4) 9^(2x - 1) = (1/27)^(x - 2)
3^(4x - 2) = 3^(6 - 3x)
4x - 2 = 6 - 3x
7x = 8
x = 8/7