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Question

If (31)3+(3)3(31)2+32x=40, then x=?

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Solution

(31)3+(3)3(31)2+(3)2x=40

(2)3+27(2)2+9x=40

8+274+9x=40

3513x=401

By Cross-multiplying , we get

35=40(13x)

35=52040x

40x=52035

40x=485

x=48540=978

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