6(2b+5)=78

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Solution for 6(2b+5)=78 equation: 



6(2b+5)=78

We move all terms to the left:

6(2b+5)-(78)=0

We multiply parentheses

12b+30-78=0

We add all the numbers together, and all the variables

12b-48=0

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

12b=48

b=48/12

b=4

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