3r+7=-4r

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Solution for 3r+7=-4r equation: 



3r+7=-4r

We move all terms to the left:

3r+7-(-4r)=0

We get rid of parentheses

3r+4r+7=0

We add all the numbers together, and all the variables

7r+7=0

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

7r=-7

r=-7/7

r=-1

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