8r+7=10r-1

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Solution for 8r+7=10r-1 equation: 



8r+7=10r-1

We move all terms to the left:

8r+7-(10r-1)=0

We get rid of parentheses

8r-10r+1+7=0

We add all the numbers together, and all the variables

-2r+8=0

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

-2r=-8

r=-8/-2

r=+4

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