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((9*x)/4)*x-((85/4)*x) = -((9/4)*x) // + (9/4)*x
((9*x)/4)*x-((85/4)*x)+(9/4)*x = 0
((9*x)/4)*x+(-85/4)*x+(9/4)*x = 0
9/4*x^2-19*x = 0
DELTA = (-19)^2-(0*9/4*4)
DELTA = 361
DELTA > 0
x = (361^(1/2)+19)/(2*9/4) or x = (19-361^(1/2))/(2*9/4)
x = 76/9 or x = 0
x in { 0, 76/9 }
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