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(x^2)/5-((x^1)/5)-6 = 0
(x^2)/5-(x/5)-6 = 0
1/5*x^2-1/5*x-6 = 0
DELTA = (-1/5)^2-(-6*1/5*4)
DELTA = 121/25
DELTA > 0
x = ((121/25)^(1/2)+1/5)/(1/5*2) or x = (1/5-(121/25)^(1/2))/(1/5*2)
x = 6 or x = -5
x in { -5, 6 }
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