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4*x^2-(28*x)+(49/2)*x-(7*x) = -2 // + 2
4*x^2-(28*x)+(49/2)*x-(7*x)+2 = 0
4*x^2-28*x+(49/2)*x-7*x+2 = 0
4*x^2-21/2*x+2 = 0
DELTA = (-21/2)^2-(2*4*4)
DELTA = 313/4
DELTA > 0
x = ((313/4)^(1/2)+21/2)/(2*4) or x = (21/2-(313/4)^(1/2))/(2*4)
x = ((313/4)^(1/2)+21/2)/8 or x = (21/2-(313/4)^(1/2))/8
x in { (21/2-(313/4)^(1/2))/8, ((313/4)^(1/2)+21/2)/8 }
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