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-(-35/10)-(13/4)
38/10+13/4*(-4/7)
----------------------
35/10-13/4
38/10+(-13/7)
-----------------
35/10-13/4
266/70-130/70
------------------
70/20-65/20
136/70
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5/20
13,6/7
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0,25
wynik w zaokrągleniu = 7,8.