3(b-5)-5b=-21

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Solution for 3(b-5)-5b=-21 equation: 



3(b-5)-5b=-21

We move all terms to the left:

3(b-5)-5b-(-21)=0

We add all the numbers together, and all the variables

-5b+3(b-5)+21=0

We multiply parentheses

-5b+3b-15+21=0

We add all the numbers together, and all the variables

-2b+6=0

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

-2b=-6

b=-6/-2

b=+3

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