r-4=5-2r

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Solution for r-4=5-2r equation: 



r-4=5-2r

We move all terms to the left:

r-4-(5-2r)=0

We add all the numbers together, and all the variables

r-(-2r+5)-4=0

We get rid of parentheses

r+2r-5-4=0

We add all the numbers together, and all the variables

3r-9=0

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

3r=9

r=9/3

r=3

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