98
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1 x 14, 2 x 7, 7 x 2, 14 x 1
2x7
2 x 7 = 14 7 x 7 = 49 2 x 7 x 7 = 98, the LCM
14 = 2 x 7, 21 = 3 x 7 and 56 = 2 x 2 x 2 x 7 GCF is 7
The answer is 7. The equation is x+14=21, so you would find x by doing 21-14=7 x=7