решите срочно!!!!!!!!!!!!!!!!!!!!
5а+10=20
(7-х) +2=8
4(х+3)=9
12-(х-3)=9
10(1+х) =40
(4+х) -5=1
1
3- _а=2
3

1
_а+5=12
2

(2х+1/0,5=10

Дополнение
в первой простой дроби

три - одна вторая = два
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