9+r=4+8

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Solution for 9+r=4+8 equation: 



9+r=4+8

We move all terms to the left:

9+r-(4+8)=0

We add all the numbers together, and all the variables

r+9-12=0

We add all the numbers together, and all the variables

r-3=0

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

r=3

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