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Find a if the coefficients of x^2and x^...

Find a if the coefficients of `x^2`and `x^3`in the expansion of `(3+a x)^9`are equal.

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Find a if the coefficients of x^2 and x^3 in the expansion of (3 + ax)^9 are equal.

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If the coefficient of x^2 and x^3 in the expansion of (3 + kx)^9 are equal, find k.