90=b*9

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Solution for 90=b*9 equation: 



90=b*9

We move all terms to the left:

90-(b*9)=0

We add all the numbers together, and all the variables

-(+b*9)+90=0

We get rid of parentheses

-b*9+90=0

Wy multiply elements

-9b+90=0

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

-9b=-90

b=-90/-9

b=+10

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