solve for x : x²-9/x+3 = 4/7
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= x power 2 - 9 /x +3 =4 /7
= ((x) power 2 - (3) power 2) /x +3 =4 /7
= (x-3)(x +3) /x +3 =4 /7
= x-3 =4 / 7
= 7(x - 3) = 4
= 7x - 21 = 4
= 7x = 4 + 21
= 7x = 25
= x = 25 / 7
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