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D( x )
x+7 = 0
x = 0
2*x = 0
x+7 = 0
x+7 = 0
x+7 = 0 // - 7
x = -7
x = 0
x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:-7) U (-7:0) U (0:+oo)
3/(x+7)+17/(2*x) = 1/x // - 1/x
3/(x+7)+17/(2*x)-(1/x) = 0
3/(x+7)+17/(2*x)-x^-1 = 0
3/(x+7)+17/(2*x)-1/x = 0
(2*3*x*x)/(2*x*x*(x+7))+(17*x*(x+7))/(2*x*x*(x+7))+(-1*2*x*(x+7))/(2*x*x*(x+7)) = 0
17*x*(x+7)-1*2*x*(x+7)+2*3*x*x = 0
23*x^2-2*x^2+119*x-14*x = 0
21*x^2+105*x = 0
21*x^2+105*x = 0
21*x*(x+5) = 0
x+5 = 0 // - 5
x = -5
21*x*(x+5) = 0
(21*x*(x+5))/(2*x*x*(x+7)) = 0
(21*x*(x+5))/(2*x*x*(x+7)) = 0 // * 2*x*x*(x+7)
21*x*(x+5) = 0
( 21*x )
21*x = 0 // : 21
x = 0
( x+5 )
x+5 = 0 // - 5
x = -5
x in { 0}
x = -5
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