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49 x 2 = 98
14 x 7 = 98
98 is the LCD
98.
LCD(49, 21) = 147
It is: 294 which is the same as its LCM
The LCD is 9.
LCD(14, 7) = 14
294
196
4900
784
LCD(5, 14) = 70
LCD(6, 14) = 42
14