6b+3b=-9

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Solution for 6b+3b=-9 equation: 



6b+3b=-9

We move all terms to the left:

6b+3b-(-9)=0

We add all the numbers together, and all the variables

9b+9=0

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

9b=-9

b=-9/9

b=-1

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