81+9b=180

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Solution for 81+9b=180 equation: 



81+9b=180

We move all terms to the left:

81+9b-(180)=0

We add all the numbers together, and all the variables

9b-99=0

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

9b=99

b=99/9

b=11

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