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x in (-oo:+oo)
A = 4*x^2+60*x+104/10 // - 4*x^2+60*x+104/10
A-(4*x^2)-(60*x)-(104/10) = 0
A-4*x^2-60*x-52/5 = 0
A-4*x^2-60*x-52/5 = 0
DELTA = (-60)^2-(-4*4*(A-52/5))
DELTA = 16*(A-52/5)+3600
16*(A-52/5)+3600 = 0
16*(A-52/5)+3600 = 0
16*A+17168/5 = 0
16*A+17168/5 = 0
16*A+17168/5 = 0 // - 17168/5
16*A = -17168/5 // : 16
A = -17168/5/16
A = -1073/5
DELTA = 0 <=> t_1 = -1073/5
x = 60/(-4*2) i A = -1073/5
x = -15/2 i A = -1073/5
( x = ((16*(A-52/5)+3600)^(1/2)+60)/(-4*2) or x = (60-(16*(A-52/5)+3600)^(1/2))/(-4*2) ) i A > -1073/5
( x = ((16*(A-52/5)+3600)^(1/2)+60)/(-8) or x = (60-(16*(A-52/5)+3600)^(1/2))/(-8) ) i A > -1073/5
A+1073/5 > 0
A+1073/5 > 0 // - 1073/5
A > -1073/5
x in { -15/2, ((16*(A-52/5)+3600)^(1/2)+60)/(-8), (60-(16*(A-52/5)+3600)^(1/2))/(-8) }
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