Решите уравнения
5x+(3x-7)=9
3y-(5-y)=11
(7a+1)-(6a+3)=5

5х+(3х-7)=95х+3х-7=98х=9+78х=16х=16:8х=23y-(5-y)=113y-5+y=114y=11+54y=16y=16:4y=4(7a+1)-(6a+3)=57a+1-6a-3=5a=5-1+3a=7a=7:1a=7