12.9(4) = x
10x = 129.(4)
100x = 1294.(4)
100x - 10x = 1294(4) - 129.(4)
90x = 1165
x = 1165 / 90
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12.9(4) = x
10x = 129.(4)
100x = 1294.(4)
100x - 10x = 1294(4) - 129.(4)
90x = 1165
x = 1165 / 90