Решите уравнение :
а) ( х + 2 ) + х = 9;
б) х+ ( 7 + х ) = 11 ;
в) Х+2Х-5=40 ;
Г) Х+(Х +4) +Х=16;
Д) (Х+50)+(Х+6) = 21 ;
е) 2(Х-8) =20
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