One-seventh = 21/7 = 3 so three-sevenths = 3 x 3 ie 9.
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2x-3=10x+21 2x-3-2x=10x+21-2x -3=8x+21 -3-21=8x+21-21 -24=8x -3=x
38/7 x 7/38 = 1 = multiplicative inverse 38/7 + -38/7 = 0 = additive inverse
21 x 3 = 63
As 21 is 3 x 7 the ratio 7:21 = 1:3
The divisors of 21 are: 1, 3, 7, 21.