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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 = (162.4^2-x^2)/(162.4^2-153.2^2) // - (162.4^2-x^2)/(162.4^2-153.2^2)
0.7-((162.4^2-x^2)/(162.4^2-153.2^2)) = 0
(-1*(162.4^2-x^2))/(162.4^2-153.2^2)+0.7 = 0
(-1*(162.4^2-x^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*(162.4^2-x^2) = 0
x^2+0.7*(162.4^2-153.2^2)-162.4^2 = 0
(x^2+0.7*(162.4^2-153.2^2)-162.4^2)/(162.4^2-153.2^2) = 0
(x^2+0.7*(162.4^2-153.2^2)-162.4^2)/(162.4^2-153.2^2) = 0 // * 162.4^2-153.2^2
x^2+0.7*(162.4^2-153.2^2)-162.4^2 = 0
1*x^2 = -(0.7*(162.4^2-153.2^2)-162.4^2) // : 1
x^2 = 162.4^2-(0.7*(162.4^2-153.2^2))
x^2 = 162.4^2-0.7*(162.4^2-153.2^2) // ^ 1/2
abs(x) = (162.4^2-0.7*(162.4^2-153.2^2))^(1/2)
x = (162.4^2-0.7*(162.4^2-153.2^2))^(1/2) or x = -(162.4^2-0.7*(162.4^2-153.2^2))^(1/2)
x in { (162.4^2-0.7*(162.4^2-153.2^2))^(1/2), -(162.4^2-0.7*(162.4^2-153.2^2))^(1/2) }
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