Solve for v
v=0
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v=3v
Combine v and 2v to get 3v.
v-3v=0
Subtract 3v from both sides.
-2v=0
Combine v and -3v to get -2v.
v=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -2 is not equal to 0, v must be equal to 0.
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Limits
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