SOLUTION: <a href='http://www.mathway.com/answer.aspx?p=calg?p=x-6ySMB01SMB15-51,SMB153x-7ySMB01SMB15-54?p=167?p=?p=?p=?p=?p=0?p=?p=0?p=?p=?p=SolveSMB15bySMB15SubstitutionSMB15Method' target

Algebra ->  Test -> SOLUTION: <a href='http://www.mathway.com/answer.aspx?p=calg?p=x-6ySMB01SMB15-51,SMB153x-7ySMB01SMB15-54?p=167?p=?p=?p=?p=?p=0?p=?p=0?p=?p=?p=SolveSMB15bySMB15SubstitutionSMB15Method' target      Log On