Solving by equating coefficients

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king of bee
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hey >>>

my q is : how can i solve this ?

[url=http://hh7.an3m1.com/][PLAIN]http://hh7.an3m1.com/Sep/an3m1.com_e885c207f11.png[/url][/PLAIN]
 

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welcome to pf!

hi king of bee! welcome to pf! :wink:
king of bee said:
my q is : how can i solve this ?

find a3 from the third equation, then a2 from the second equation, then a1 from the first equation …

what do you get? :smile:​
 
Not "differential equations" so I am moving this.