7=9+r/2

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Solution for 7=9+r/2 equation: 



7=9+r/2

We move all terms to the left:

7-(9+r/2)=0

We add all the numbers together, and all the variables

-(r/2+9)+7=0

We get rid of parentheses

-r/2-9+7=0

We multiply all the terms by the denominator


-r-9*2+7*2=0

We add all the numbers together, and all the variables

-1r-4=0

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

-r=4

r=4/-1

r=-4

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