Răspuns :
2 * (3x+1) -1=43
2 * (3x+1) =43+1
2 * (3x+1) =44
3x+1=44:2
3x+1=22
3x=22-1
3x=21
x=21:3
x=7
2 * (3x+1) =43+1
2 * (3x+1) =44
3x+1=44:2
3x+1=22
3x=22-1
3x=21
x=21:3
x=7