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v in (-oo:+oo)
(7/3)*v = ((-20/61)/3)*v // - ((-20/61)/3)*v
(7/3)*v-(((-20/61)/3)*v) = 0
(7/3)*v+(20/183)*v = 0
149/61*v = 0 // : 149/61
v = 0
v = 0
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