Question: Problem with solve a vector


I'm writting because I don't know how to solve this problem. I look for it in the web, but I don't

find the solution.


I have a vector with 4 variables, for example:

[54*a +3*b -c +d, 32*a -c +d, 96*b -69*c +85*d, 6*a + 9*b+3*c+9*d]

In really there is 4 equations. And I need to solve with other vector like:



I don't know the commands for do this... I search it in internet but I don't find anything.


A lot of Thanks.



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