7=5-2r

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Solution for 7=5-2r equation: 



7=5-2r

We move all terms to the left:

7-(5-2r)=0

We add all the numbers together, and all the variables

-(-2r+5)+7=0

We get rid of parentheses

2r-5+7=0

We add all the numbers together, and all the variables

2r+2=0

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

2r=-2

r=-2/2

r=-1

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