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16 = 4-(x*((5*(x-1))/2)) // - 4-(x*((5*(x-1))/2))
x*((5*(x-1))/2)-4+16 = 0
(5*x*(x-1))/2-4+16 = 0
(5*x*(x-1))/2+(-4*2)/2+(2*16)/2 = 0
5*x*(x-1)-4*2+2*16 = 0
5*x^2-5*x-8+32 = 0
5*x^2-5*x+24 = 0
5*x^2-5*x+24 = 0
5*x^2-5*x+24 = 0
DELTA = (-5)^2-(4*5*24)
DELTA = -455
DELTA < 0
1 = 0
1/2 = 0
1/2 = 0 // * 2
1 = 0
x belongs to the empty set
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