Question

$find \: the \: value \: of x \: {3}^{2} x + 4 = 343$
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Answer 1

3²x+4=343.

9x+4=343. (Because 3²=9).

9x=343-4.

9x=339.

x=339/9.

x=37.666666......

I think this is your answer.