SOLUTION: Solve by the substitution method  3x+7y=25  x+20-4y
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Question 498842:  Solve by the substitution method  3x+7y=25  x+20-4y 
Answer by ankor@dixie-net.com(22740)   (Show Source): You can put this solution on YOUR website!
 x+20-4y is not an equation 
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