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D( x )
162.4^2-153.2^2 = 0
162.4^2-153.2^2 = 0
162.4^2-153.2^2 = 0
162.4^2-153.2^2 = 0
x belongs to the empty set
x in (-oo:+oo)
0.7 = (x^2-153.2^2)/(162.4^2-153.2^2) // - (x^2-153.2^2)/(162.4^2-153.2^2)
0.7-((x^2-153.2^2)/(162.4^2-153.2^2)) = 0
(-1*(x^2-153.2^2))/(162.4^2-153.2^2)+0.7 = 0
(-1*(x^2-153.2^2))/(162.4^2-153.2^2)+(0.7*(162.4^2-153.2^2))/(162.4^2-153.2^2) = 0
0.7*(162.4^2-153.2^2)-1*(x^2-153.2^2) = 0
0.7*(162.4^2-153.2^2)-x^2+153.2^2 = 0
(0.7*(162.4^2-153.2^2)-x^2+153.2^2)/(162.4^2-153.2^2) = 0
(0.7*(162.4^2-153.2^2)-x^2+153.2^2)/(162.4^2-153.2^2) = 0 // * 162.4^2-153.2^2
0.7*(162.4^2-153.2^2)-x^2+153.2^2 = 0
-1*x^2 = -(0.7*(162.4^2-153.2^2)+153.2^2) // : -1
x^2 = 0.7*(162.4^2-153.2^2)+153.2^2
x^2 = 0.7*(162.4^2-153.2^2)+153.2^2 // ^ 1/2
abs(x) = (0.7*(162.4^2-153.2^2)+153.2^2)^(1/2)
x = (0.7*(162.4^2-153.2^2)+153.2^2)^(1/2) or x = -(0.7*(162.4^2-153.2^2)+153.2^2)^(1/2)
x in { (0.7*(162.4^2-153.2^2)+153.2^2)^(1/2), -(0.7*(162.4^2-153.2^2)+153.2^2)^(1/2) }
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