<PRE><B>Question 270712</B>
equation is:


7r-5r+2=5r-r


combine like terms to get:


2r + 2 = 4r


subtract 2r from both sides of equation to get:


2 = 2r


divide both sides of equation by 2 to get r = 1


substitute in original equation to see if this is good.


original equation is:


7r-5r+2=5r-r


substitute 1 for r to get:


7 - 5 + 2 = 5 - 1 which becomes:


4 = 4 which is true, confirming that r = 1 is good.


</PRE>