Question

Afla nr necunoscut in expresia urm 4+2×[2+(6+a)÷3]-20=0

Answer 1

a=12
4+2×[2+(6+12):3]-20=0
4+2×[2+18:3]-20=0
4+2×[2+6]-20=0
4+2×8-20=0
4+16-20=0
20-20=0