18+4r=66

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Solution for 18+4r=66 equation: 



18+4r=66

We move all terms to the left:

18+4r-(66)=0

We add all the numbers together, and all the variables

4r-48=0

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

4r=48

r=48/4

r=12

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