Răspuns :
2•(x+7)-14=28
=2•(x+7)=28+14
=2•(x+7)=42
=x+7=42÷2
x+7=21
x=21-7
x=14
Mult succes!
=2•(x+7)=28+14
=2•(x+7)=42
=x+7=42÷2
x+7=21
x=21-7
x=14
Mult succes!
2×(x+7)=28+14
2×(x+7)=42
x+7=42:2
x+7=21
x=21-7
x=14
2×(14+7)-14=2×21-14
=42-14
= 28
2×(x+7)=42
x+7=42:2
x+7=21
x=21-7
x=14
2×(14+7)-14=2×21-14
=42-14
= 28