5-9а-(а+1)=4
5-9а-а-1=4
-10а=4+1-5
-10а=0
а=0
7+8а+5=2а+1
8а-2а=1-7-5
6а=-11
а=-1 5/6
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5-9а-(а+1)=4
5-9а-а-1=4
-10а=4+1-5
-10а=0
а=0
7+8а+5=2а+1
8а-2а=1-7-5
6а=-11
а=-1 5/6
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