49x ^ 3 - 14x ^ 2 + x = 0
x(49x ^ 2 - 14x + 1) = 0
49x ^ 2 - 14x + 1 = 0
(7x - 1) ^ 2 = 0
7x - 1 = 0
x = 1/7
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49x ^ 3 - 14x ^ 2 + x = 0
x(49x ^ 2 - 14x + 1) = 0
49x ^ 2 - 14x + 1 = 0
(7x - 1) ^ 2 = 0
7x - 1 = 0
x = 1/7