http://www.algebrahelp.com/lessons/equationbasics/ [2]
http://www.algebrahelp.com/lessons/proportionbasics/ [3]
http://www.algebrahelp.com/lessons/wordproblems/basics/ [4]
Links[1] https://www.hootsgo.org/?q=node/6274 [2] http://www.algebrahelp.com/lessons/equationbasics/ [3] http://www.algebrahelp.com/lessons/proportionbasics/ [4] http://www.algebrahelp.com/lessons/wordproblems/basics/
