3r+(-4)r=9

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Solution for 3r+(-4)r=9 equation: 



3r+(-4)r=9

We move all terms to the left:

3r+(-4)r-(9)=0

We multiply parentheses

3r-4r-9=0

We add all the numbers together, and all the variables

-1r-9=0

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

-r=9

r=9/-1

r=-9

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