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D( x )
2*x-(12*x)-13^2 = 0
2*x-(12*x)-13^2 = 0
2*x-(12*x)-13^2 = 0
2*x-12*x-13^2 = 0
-10*x-169 = 0 // + 169
-10*x = 169 // : -10
x = 169/(-10)
x = -169/10
x in (-oo:-169/10) U (-169/10:+oo)
(15*x)/(2*x-(12*x)-13^2)-15 = 0
(15*x)/(2*x-12*x-13^2)-15 = 0
(15*x)/(-10*x-169)-15 = 0
(15*x)/(-10*x-169)+(-15*(-10*x-169))/(-10*x-169) = 0
15*x-15*(-10*x-169) = 0
165*x+2535 = 0
(165*x+2535)/(-10*x-169) = 0
(165*x+2535)/(-10*x-169) = 0 // * -10*x-169
165*x+2535 = 0
165*x+2535 = 0 // - 2535
165*x = -2535 // : 165
x = -2535/165
x = -169/11
x = -169/11
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