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a+b = 30 ..pers 1
tba - tbb = 4
a+0,5 - (b-0,5) = 4
a - b + 1 = 4
a - b = 3 ...pers 2
a+b = 30
a-b = 3
---------------- -
2b = 27
b = 27/2
b = 13, 5
tbb = b-0,5
= 13,5 - 0,5
= 13