5r+4r=-9

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Solution for 5r+4r=-9 equation: 



5r+4r=-9

We move all terms to the left:

5r+4r-(-9)=0

We add all the numbers together, and all the variables

9r+9=0

We move all terms containing r to the left, all other terms to the right

9r=-9

r=-9/9

r=-1

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