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in which the coefficient of x is 2.

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i don't get this problem at all, but here's what i came up with after sitting here at the computer for a long time attempting to do this problem.

okay i know that by theorem, The vector a X b is orthogonal to both a and b.

a = <-1,-2,-3>

b= <2,-5,2>

that's all i came up, i attempted many different ways, but it doesn't make sense at all, can someone lend me a hand?