4=90-2b

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Solution for 4=90-2b equation: 



4=90-2b

We move all terms to the left:

4-(90-2b)=0

We add all the numbers together, and all the variables

-(-2b+90)+4=0

We get rid of parentheses

2b-90+4=0

We add all the numbers together, and all the variables

2b-86=0

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

2b=86

b=86/2

b=43

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