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x in (-oo:+oo)
((3*x)/55)*(9*x-55) = 90 // - 90
((3*x)/55)*(9*x-55)-90 = 0
3/55*x*(9*x-55)-90 = 0
3/55*x*(9*x-55)-90 = 0
27/55*x^2-3*x-90 = 0
27/55*x^2-3*x-90 = 0
3*(9/55*x^2-x-30) = 0
9/55*x^2-x-30 = 0
DELTA = (-1)^2-(-30*9/55*4)
DELTA = 227/11
DELTA > 0
x = ((227/11)^(1/2)+1)/(9/55*2) or x = (1-(227/11)^(1/2))/(9/55*2)
x = 55/18*((227/11)^(1/2)+1) or x = 55/18*(1-(227/11)^(1/2))
3*(x-55/18*(1-(227/11)^(1/2)))*(x-55/18*((227/11)^(1/2)+1)) = 0
3*(x-55/18*(1-(227/11)^(1/2)))*(x-55/18*((227/11)^(1/2)+1)) = 0
( x-55/18*((227/11)^(1/2)+1) )
x-55/18*((227/11)^(1/2)+1) = 0 // + -55/18*((227/11)^(1/2)+1)
x = -(-55/18*((227/11)^(1/2)+1))
x = 55/18*((227/11)^(1/2)+1)
( x-55/18*(1-(227/11)^(1/2)) )
x-55/18*(1-(227/11)^(1/2)) = 0 // + -55/18*(1-(227/11)^(1/2))
x = -(-55/18*(1-(227/11)^(1/2)))
x = 55/18*(1-(227/11)^(1/2))
x in { 55/18*((227/11)^(1/2)+1), 55/18*(1-(227/11)^(1/2)) }
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