2) (29/42 - а) - 13/42 = 11/42 3) 15/17 - (b - 3/17) = 6/17
29/42 - а = 11/42 + 13/42 b - 3/17 = 15/17 - 6/17
29/42 - а = 24/42 b - 3/17 = 9/17
а = 29/42 - 24/42 b = 9/17 + 3/17
а = 5/42 b = 12/17
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4) 29/43 - (m + 13/43) = 5/43
m + 13/43 = 29/43 - 5/43
m + 13/43 = 24/43
m = 24/43 - 13/43
m = 11/43
