1) 12+(а-14)=12+а-14=а-2
2) а+(26-а)=а+26-а=26
3) 27-(20-а)=27-20+а=7+а
4) -(а+6)+10=-а-6+10=4-а
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1) 12+(а-14)=12+а-14=а-2
2) а+(26-а)=а+26-а=26
3) 27-(20-а)=27-20+а=7+а
4) -(а+6)+10=-а-6+10=4-а