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= ( 3x - 4) ^2 + (7)^2/ 7 (3x -4) = 5/ 2
= 9 x ^2 - 24x + 16 + 49 / 21x - 28 = 5/2
= 9 x ^2 - 24x + 65 / 21 x - 28 = 5/ 2
= 18 x ^2 - 48 x + 130 = 105 x - 140
= 18x ^2 -153 x + 270
= 2 x ^2 - 17 x + 30
= 2x^2 +3x - 20x + 30
= x(2 x + 3) - 10 (2x + 3)
=(x-10)(2x+3)
therefore x = 10 or x = -3 / 2
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