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x in (-oo:+oo)
((x-3)^2)/5 = 30 // - 30
((x-3)^2)/5-30 = 0
((x-3)^2)/5+(-30*5)/5 = 0
(x-3)^2-30*5 = 0
x^2-6*x-141 = 0
x^2-6*x-141 = 0
x^2-6*x-141 = 0
DELTA = (-6)^2-(-141*1*4)
DELTA = 600
DELTA > 0
x = (600^(1/2)+6)/(1*2) or x = (6-600^(1/2))/(1*2)
x = (10*6^(1/2)+6)/2 or x = (6-10*6^(1/2))/2
(x-((6-10*6^(1/2))/2))*(x-((10*6^(1/2)+6)/2)) = 0
((x-((6-10*6^(1/2))/2))*(x-((10*6^(1/2)+6)/2)))/5 = 0
((x-((6-10*6^(1/2))/2))*(x-((10*6^(1/2)+6)/2)))/5 = 0 // * 5
(x-((6-10*6^(1/2))/2))*(x-((10*6^(1/2)+6)/2)) = 0
( x-((10*6^(1/2)+6)/2) )
x-((10*6^(1/2)+6)/2) = 0 // + (10*6^(1/2)+6)/2
x = (10*6^(1/2)+6)/2
( x-((6-10*6^(1/2))/2) )
x-((6-10*6^(1/2))/2) = 0 // + (6-10*6^(1/2))/2
x = (6-10*6^(1/2))/2
x in { (10*6^(1/2)+6)/2, (6-10*6^(1/2))/2 }
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