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D( v )
2*v = 0
5*v = 0
2*v = 0
2*v = 0
2*v = 0 // : 2
v = 0
5*v = 0
5*v = 0
5*v = 0 // : 5
v = 0
v in (-oo:0) U (0:+oo)
3/(5*v) = 7/(2*v)+1/10 // - 7/(2*v)+1/10
3/(5*v)-(7/(2*v))-(1/10) = 0
3/(5*v)+(-7/2)*v^-1-1/10 = 0
-29/10*v^-1 = 1/10 // : -29/10
v^-1 = -1/29
-1 < 0
1/(v^1) = -1/29 // * v^1
1 = -1/29*v^1 // : -1/29
-29 = v^1
v = -29
v = -29
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