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x in (-oo:+oo)
x*((3*(x-6))/4) = 36 // - 36
x*((3*(x-6))/4)-36 = 0
(3*x*(x-6))/4-36 = 0
(3*x*(x-6))/4+(-36*4)/4 = 0
3*x*(x-6)-36*4 = 0
3*x^2-18*x-144 = 0
3*x^2-18*x-144 = 0
3*(x^2-6*x-48) = 0
x^2-6*x-48 = 0
DELTA = (-6)^2-(-48*1*4)
DELTA = 228
DELTA > 0
x = (228^(1/2)+6)/(1*2) or x = (6-228^(1/2))/(1*2)
x = (2*57^(1/2)+6)/2 or x = (6-2*57^(1/2))/2
3*(x-((6-2*57^(1/2))/2))*(x-((2*57^(1/2)+6)/2)) = 0
(3*(x-((6-2*57^(1/2))/2))*(x-((2*57^(1/2)+6)/2)))/4 = 0
(3*(x-((6-2*57^(1/2))/2))*(x-((2*57^(1/2)+6)/2)))/4 = 0 // * 4
3*(x-((6-2*57^(1/2))/2))*(x-((2*57^(1/2)+6)/2)) = 0
( x-((2*57^(1/2)+6)/2) )
x-((2*57^(1/2)+6)/2) = 0 // + (2*57^(1/2)+6)/2
x = (2*57^(1/2)+6)/2
( x-((6-2*57^(1/2))/2) )
x-((6-2*57^(1/2))/2) = 0 // + (6-2*57^(1/2))/2
x = (6-2*57^(1/2))/2
x in { (2*57^(1/2)+6)/2, (6-2*57^(1/2))/2 }
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