5+r+7-8r=4r-7r

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Solution for 5+r+7-8r=4r-7r equation: 



5+r+7-8r=4r-7r

We move all terms to the left:

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

We add all the numbers together, and all the variables

r-8r-(-3r)+5+7=0

We add all the numbers together, and all the variables

-7r-(-3r)+12=0

We get rid of parentheses

-7r+3r+12=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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