Răspuns :
81:3-2*(a+1)=19
27-2(a+1)=19
-2(a+1)=19-27
-2(a+1)=-8
2(a+1)=8
a+1=4
a=3
Bună!
[tex]81:3-2*(a+1)=19 <=> 27-2a-2=19 <=> 25-2a=19 => 2a=6 => a=3[/tex]
81:3-2*(a+1)=19
27-2(a+1)=19
-2(a+1)=19-27
-2(a+1)=-8
2(a+1)=8
a+1=4
a=3
Bună!
[tex]81:3-2*(a+1)=19 <=> 27-2a-2=19 <=> 25-2a=19 => 2a=6 => a=3[/tex]