You can put this solution on YOUR website! Let x=Juan's age today
Then 2(x-23)+7=Juan's age 23 years ago
soooooo:
x=2(x-23)+7
x=2x-46+7
x=2x-39 collect like terms
x=39----Juan's age today
CK
2(39-23)+7=
2(16)+7=
32+7=39
39=39
Hope this helps----ptaylor