3b=20-30

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Solution for 3b=20-30 equation: 



3b=20-30

We move all terms to the left:

3b-(20-30)=0

We add all the numbers together, and all the variables

3b-(-10)=0

We add all the numbers together, and all the variables

3b+10=0

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

3b=-10

b=-10/3

b=-3+1/3

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