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x in (-oo:+oo)
x*((x+87/10)/0.5) = 33/10 // - 33/10
x*((x+87/10)/0.5)-(33/10) = 0
x*((x+87/10)/0.5)-33/10 = 0
(x*(x+87/10))/0.5-33/10 = 0
(10*x*(x+87/10))/(0.5*10)+(-33*0.5)/(0.5*10) = 0
10*x*(x+87/10)-33*0.5 = 0
10*x^2+87*x-16.5 = 0
10*x^2+87*x-16.5 = 0
10*x^2+87*x-16.5 = 0
DELTA = 87^2-(-16.5*4*10)
DELTA = 8229
DELTA > 0
x = (8229^(1/2)-87)/(2*10) or x = (-8229^(1/2)-87)/(2*10)
x = (8229^(1/2)-87)/20 or x = (-(8229^(1/2)+87))/20
(x+(8229^(1/2)+87)/20)*(x-((8229^(1/2)-87)/20)) = 0
((x+(8229^(1/2)+87)/20)*(x-((8229^(1/2)-87)/20)))/(0.5*10) = 0
((x+(8229^(1/2)+87)/20)*(x-((8229^(1/2)-87)/20)))/(0.5*10) = 0 // * 0.5*10
(x+(8229^(1/2)+87)/20)*(x-((8229^(1/2)-87)/20)) = 0
( x+(8229^(1/2)+87)/20 )
x+(8229^(1/2)+87)/20 = 0 // - (8229^(1/2)+87)/20
x = -((8229^(1/2)+87)/20)
( x-((8229^(1/2)-87)/20) )
x-((8229^(1/2)-87)/20) = 0 // + (8229^(1/2)-87)/20
x = (8229^(1/2)-87)/20
x in { -((8229^(1/2)+87)/20), (8229^(1/2)-87)/20 }
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