3r+4=7r-8

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Solution for 3r+4=7r-8 equation: 



3r+4=7r-8

We move all terms to the left:

3r+4-(7r-8)=0

We get rid of parentheses

3r-7r+8+4=0

We add all the numbers together, and all the variables

-4r+12=0

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

-4r=-12

r=-12/-4

r=+3

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