7+8r=-9+10r

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Solution for 7+8r=-9+10r equation: 



7+8r=-9+10r

We move all terms to the left:

7+8r-(-9+10r)=0

We add all the numbers together, and all the variables

8r-(10r-9)+7=0

We get rid of parentheses

8r-10r+9+7=0

We add all the numbers together, and all the variables

-2r+16=0

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

-2r=-16

r=-16/-2

r=+8

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