5=4(10+9b)

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Solution for 5=4(10+9b) equation: 



5=4(10+9b)

We move all terms to the left:

5-(4(10+9b))=0

We add all the numbers together, and all the variables

-(4(9b+10))+5=0



We calculate terms in parentheses: -(4(9b+10)), so:

4(9b+10)

We multiply parentheses

36b+40

Back to the equation:

-(36b+40)



We get rid of parentheses

-36b-40+5=0

We add all the numbers together, and all the variables

-36b-35=0

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

-36b=35

b=35/-36

b=-35/36

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