20+9b=7

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Solution for 20+9b=7 equation: 



20+9b=7

We move all terms to the left:

20+9b-(7)=0

We add all the numbers together, and all the variables

9b+13=0

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

9b=-13

b=-13/9

b=-1+4/9

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