7r+8=5r-4

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



7r+8=5r-4

We move all terms to the left:

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

We get rid of parentheses

7r-5r+4+8=0

We add all the numbers together, and all the variables

2r+12=0

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

2r=-12

r=-12/2

r=-6

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