Ответ:
10-х+2(3х+5)=21
6х+10-х+10=21
(х+6х)+(10+10)=21
5х+(10+10)=21
5х+20=21
5х+(20-20)=21-20
5х=21-20
5х=1
х=1/5
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Ответ:
10-х+2(3х+5)=21
6х+10-х+10=21
(х+6х)+(10+10)=21
5х+(10+10)=21
5х+20=21
5х+(20-20)=21-20
5х=21-20
5х=1
х=1/5