100=4r+12

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Solution for 100=4r+12 equation: 



100=4r+12

We move all terms to the left:

100-(4r+12)=0

We get rid of parentheses

-4r-12+100=0

We add all the numbers together, and all the variables

-4r+88=0

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

-4r=-88

r=-88/-4

r=+22

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