№5
( а-в+11) + ( в-а+6) = а-в+11+в-а+6=17
№6
( х-у-16) - ( 26+у+х) = х-у-16-26-у-х= - 2у-42 = -2 (у+21)
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№5
( а-в+11) + ( в-а+6) = а-в+11+в-а+6=17
№6
( х-у-16) - ( 26+у+х) = х-у-16-26-у-х= - 2у-42 = -2 (у+21)