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D( s )
10*s+10 = 0
10*s+10 = 0
10*s+10 = 0
10*s+10 = 0 // - 10
10*s = -10 // : 10
s = -10/10
s = -1
s in (-oo:-1) U (-1:+oo)
(7*s)/(10*s+10)+(1/3)*s = 0
(7*s)/(10*s+10)+s/3 = 0
(3*7*s)/(3*(10*s+10))+(s*(10*s+10))/(3*(10*s+10)) = 0
s*(10*s+10)+3*7*s = 0
10*s^2+31*s = 0
10*s^2+31*s = 0
s*(10*s+31) = 0
10*s+31 = 0 // - 31
10*s = -31 // : 10
s = -31/10
s*(s+31/10) = 0
(s*(s+31/10))/(3*(10*s+10)) = 0
(s*(s+31/10))/(3*(10*s+10)) = 0 // * 3*(10*s+10)
s*(s+31/10) = 0
( s+31/10 )
s+31/10 = 0 // - 31/10
s = -31/10
( s )
s = 0
s in { -31/10, 0 }
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