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D( x )
2*x-(12*x)-13^2-15 = 0
2*x-(12*x)-13^2-15 = 0
2*x-(12*x)-13^2-15 = 0
2*x-12*x-13^2-15 = 0
-10*x-184 = 0 // + 184
-10*x = 184 // : -10
x = 184/(-10)
x = -92/5
x in (-oo:-92/5) U (-92/5:+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-184) = 0
15*x = 0 // : 15
x = 0
x = 0
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