Răspuns :
prima metoda: 2(x+3)+17=59
2(x+3)=59-17
2(x+3)=42
x+3=42:2
x+3=21
x=18
a doua metoda: 2(x+3)+17=59
2x+2x3+17=59
2x+6=42
2x=42-6
2x=36
x=18
2(x+3)=59-17
2(x+3)=42
x+3=42:2
x+3=21
x=18
a doua metoda: 2(x+3)+17=59
2x+2x3+17=59
2x+6=42
2x=42-6
2x=36
x=18