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D( x )
3*(x-5) = 0
3*(x-5) = 0
3*(x-5) = 0
( 3 )
3 = 0
x belongs to the empty set
( x-5 )
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
36/(3*(x-5)) = 6 // - 6
36/(3*(x-5))-6 = 0
36/(3*(x-5))+(-6*3*(x-5))/(3*(x-5)) = 0
36-6*3*(x-5) = 0
126-18*x = 0
(126-18*x)/(3*(x-5)) = 0
(126-18*x)/(3*(x-5)) = 0 // * 3*(x-5)
126-18*x = 0
126-18*x = 0 // - 126
-18*x = -126 // : -18
x = -126/(-18)
x = 7
x = 7
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