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5 (X & sup2; - 6x + 9) - 4 = 21 solution equation
5（x²-6x+9)-4=21
5（x²-6x+9)=25
(x-3)²=5
x-3=±√5
x=3±√5
3 (x + 0.5) = 21 solutions
3(x+0.5)=21
x+0.5=7
x=7-0.5=6.5
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