(B)12r-18=13r+18

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Solution for (B)12r-18=13r+18 equation: 



()12B-18=13B+18

We move all terms to the left:

()12B-18-(13B+18)=0

We get rid of parentheses

()12B-13B-18-18=0

We add all the numbers together, and all the variables

-13B+()12B-36=0

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

-13B+()12B=36

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