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D( y )
6*y-18 = 0
10*y-30 = 0
6*y-18 = 0
6*y-18 = 0
6*y-18 = 0 // + 18
6*y = 18 // : 6
y = 18/6
y = 3
10*y-30 = 0
10*y-30 = 0
10*y-30 = 0 // + 30
10*y = 30 // : 10
y = 30/10
y = 3
y in (-oo:3) U (3:+oo)
(3*y)/(10*y-30)+(5*y)/(6*y-18) = 0
(3*y*(6*y-18))/((10*y-30)*(6*y-18))+(5*y*(10*y-30))/((10*y-30)*(6*y-18)) = 0
3*y*(6*y-18)+5*y*(10*y-30) = 0
68*y^2-204*y = 0
68*y^2-204*y = 0
68*y*(y-3) = 0
y-3 = 0 // + 3
y = 3
68*y*(y-3) = 0
(68*y*(y-3))/((10*y-30)*(6*y-18)) = 0
(68*y*(y-3))/((10*y-30)*(6*y-18)) = 0 // * (10*y-30)*(6*y-18)
68*y*(y-3) = 0
( 68*y )
68*y = 0 // : 68
y = 0
( y-3 )
y-3 = 0 // + 3
y = 3
y in { 3}
y = 0
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