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"how to solve to find u value

<3,-7> = (9/10)<-1,-3> + u"

Notation here is not clear. Are <3, -7> and <-1, -3> points or notation for a special vector? What is u"? Is it just u with an endquote? Is it the 2nd derivative wrt time of u? If u" is an ordered pair denoting a vector from the origin, then

u" = (u1, u2) = < 3 +(9/10), -7 + (9/10)3 >.

Let me know if this is what you have in mind. Please be more careful with your notation and explain your terms.

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