7=r-4/2

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Solution for 7=r-4/2 equation: 



7=r-4/2

We move all terms to the left:

7-(r-4/2)=0

We add all the numbers together, and all the variables

-(r-2)+7=0

We get rid of parentheses

-r+2+7=0

We add all the numbers together, and all the variables

-1r+9=0

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

-r=-9

r=-9/-1

r=+9

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