Question

{100-[0+3×(56+××9):6]}×123=0

Answer 1

100-[0+3*(56+x*9):6]=0:123
100-[0+3*(56+x*9):6]=0
0+3*(56+x*9):6=0+100
0+3*(56+x*9):6=100
3*(56+x*9)=100*6
3*(56+x*9)=600
56+x*9=600:3
56+x*9=200
x*9=200-56
x*9=144
x=144:9
x=16