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D( x )
5*x+15 = 0
2*x+6 = 0
5*x+15 = 0
5*x+15 = 0
5*x+15 = 0 // - 15
5*x = -15 // : 5
x = -15/5
x = -3
2*x+6 = 0
2*x+6 = 0
2*x+6 = 0 // - 6
2*x = -6 // : 2
x = -6/2
x = -3
x in (-oo:-3) U (-3:+oo)
2/(5*x+15)-(3/(2*x+6)) = 0
2/(5*x+15)-3*(2*x+6)^-1 = 0
2/(5*x+15)-3/(2*x+6) = 0
(2*(2*x+6))/((5*x+15)*(2*x+6))+(-3*(5*x+15))/((5*x+15)*(2*x+6)) = 0
2*(2*x+6)-3*(5*x+15) = 0
-11*x-33 = 0
(-11*x-33)/((5*x+15)*(2*x+6)) = 0
(-11*x-33)/((5*x+15)*(2*x+6)) = 0 // * (5*x+15)*(2*x+6)
-11*x-33 = 0
-11*x-33 = 0 // + 33
-11*x = 33 // : -11
x = 33/(-11)
x = -3
x in { -3}
x belongs to the empty set
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