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(6*x^2+30*x-36)/0.25 = 0
6*x^2+30*x-36 = 0
6*(x^2+5*x-6) = 0
x^2+5*x-6 = 0
DELTA = 5^2-(-6*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)-5)/(1*2) or x = (-49^(1/2)-5)/(1*2)
x = 1 or x = -6
6*(x+6)*(x-1) = 0
(6*(x+6)*(x-1))/0.25 = 0
( x+6 )
x+6 = 0 // - 6
x = -6
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -6, 1 }
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