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-9r+4=-5r-4r
We move all terms to the left:
-9r+4-(-5r-4r)=0
We add all the numbers together, and all the variables
-9r-(-9r)+4=0
We get rid of parentheses
-9r+9r+4=0
We add all the numbers together, and all the variables
4!=0
There is no solution for this equation
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