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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((10*x)/x+5)*(x^2-(2*x)-((35/2)*x)) = 0
((10*x)/x+5)*(x^2-2*x+(-35/2)*x) = 0
15*(x^2-39/2*x) = 0
x^2-39/2*x = 0
x*(x-39/2) = 0
x-39/2 = 0 // + 39/2
x = 39/2
x*(x-39/2) = 0
15*x*(x-39/2) = 0
( x-39/2 )
x-39/2 = 0 // + 39/2
x = 39/2
( x )
x = 0
x in { 0}
x = 39/2
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