7b-8=9b+-12

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Solution for 7b-8=9b+-12 equation: 



7b-8=9b+-12

We move all terms to the left:

7b-8-(9b+-12)=0

We add all the numbers together, and all the variables

7b-(9b-12)-8=0

We get rid of parentheses

7b-9b+12-8=0

We add all the numbers together, and all the variables

-2b+4=0

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

-2b=-4

b=-4/-2

b=+2

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