8b+9=-4b+57

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Solution for 8b+9=-4b+57 equation: 



8b+9=-4b+57

We move all terms to the left:

8b+9-(-4b+57)=0

We get rid of parentheses

8b+4b-57+9=0

We add all the numbers together, and all the variables

12b-48=0

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

12b=48

b=48/12

b=4

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