Răspuns :
[( a+5)×2]-4=26
[( a+5)×2]=26+4
[(a+5)×2]=30
a+5=30:2
a+5=15
a=15-5
a=10
Răspuns:
- notam nr. cu x
[(x+5)×2]-4=26
[2x+10]-4=26
2x+10-4=26
2x+6=26
2x=20
x=10
[( a+5)×2]-4=26
[( a+5)×2]=26+4
[(a+5)×2]=30
a+5=30:2
a+5=15
a=15-5
a=10
Răspuns:
- notam nr. cu x
[(x+5)×2]-4=26
[2x+10]-4=26
2x+10-4=26
2x+6=26
2x=20
x=10