3(4b+5)=12b-21

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Solution for 3(4b+5)=12b-21 equation: 



3(4b+5)=12b-21

We move all terms to the left:

3(4b+5)-(12b-21)=0

We multiply parentheses

12b-(12b-21)+15=0

We get rid of parentheses

12b-12b+21+15=0

We add all the numbers together, and all the variables

36!=0

There is no solution for this equation

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