Х^2 /(x-7) + x - 12/(x - 7) = 0 Общий знаменатель (х - 7)
х^2 +x(x-7) - 12 = 0
x^2 + x^2 - 7x - 12 = 0
2x^2 - 7x - 12 = 0
D = 49 - 4 * 12 * 2 = 49 + 96 = 145 √D ≈ 12,04
x1 = (7 + 12,04) /4 = 19,04/4 = 4,76
x2 = (7 - 12,04)/4 = - 5,04/4 = - 1,26
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7/2 - 2/(х - 5) = 0 Общ.знамен.= 2(х - 5)
7(х -5) - 2*2 = 0
7х - 35 - 4 = 0
7х = 39
х = 5 4/7