3-r=12-22

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Solution for 3-r=12-22 equation: 



3-r=12-22

We move all terms to the left:

3-r-(12-22)=0

We add all the numbers together, and all the variables

-r+3-(-10)=0

We add all the numbers together, and all the variables

-1r+13=0

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

-r=-13

r=-13/-1

r=+13

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