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How do you solve a utility problem that yields demand function for good x and good...

How do you solve a utility problem that yields demand function for good x and good y
we have three goods,x1,X2,x3 income ,M and prices ,P1,p2,p3 and utility function U=U(X1,X2,x3)=3logX2+3logX2+2logx3

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