3(4a-7)=123

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Solution for 3(4a-7)=123 equation: 



3(4a-7)=123

We move all terms to the left:

3(4a-7)-(123)=0

We multiply parentheses

12a-21-123=0

We add all the numbers together, and all the variables

12a-144=0

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

12a=144

a=144/12

a=12

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