12+6r=90

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Solution for 12+6r=90 equation: 



12+6r=90

We move all terms to the left:

12+6r-(90)=0

We add all the numbers together, and all the variables

6r-78=0

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

6r=78

r=78/6

r=13

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