10(5+b)=90

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Solution for 10(5+b)=90 equation: 



10(5+b)=90

We move all terms to the left:

10(5+b)-(90)=0

We add all the numbers together, and all the variables

10(b+5)-90=0

We multiply parentheses

10b+50-90=0

We add all the numbers together, and all the variables

10b-40=0

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

10b=40

b=40/10

b=4

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