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X & # 178; - 4x = 1 to find x
x²-4x=1
x^2-4x+4=1+4
(x-2)^2=5
X-2 = ± root 5
X1 = 2 + radical 5, X2 = 2-radical 5
Calculation 49x & # 178; = 25
49X²=25
x² = 25/49
x= ﹢﹣5/7
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