x = 2.1(2)
10x = 21.(2)
100x = 212.(2)
100x - 10x = 212.(2) - 21.(2)
90x = 191
x = 191/90
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Verified answer
x = 2.1(2)
10x = 21.(2)
100x = 212.(2)
100x - 10x = 212.(2) - 21.(2)
90x = 191
x = 191/90