2b+10=4b+20=90

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Solution for 2b+10=4b+20=90 equation: 



2b+10=4b+20=90

We move all terms to the left:

2b+10-(4b+20)=0

We get rid of parentheses

2b-4b-20+10=0

We add all the numbers together, and all the variables

-2b-10=0

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

-2b=10

b=10/-2

b=-5

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