16=12+r

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Solution for 16=12+r equation: 



16=12+r

We move all terms to the left:

16-(12+r)=0

We add all the numbers together, and all the variables

-(r+12)+16=0

We get rid of parentheses

-r-12+16=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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