100-3b=85

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Solution for 100-3b=85 equation: 



100-3b=85

We move all terms to the left:

100-3b-(85)=0

We add all the numbers together, and all the variables

-3b+15=0

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

-3b=-15

b=-15/-3

b=+5

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