3(a-21)=78

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Solution for 3(a-21)=78 equation: 



3(a-21)=78

We move all terms to the left:

3(a-21)-(78)=0

We multiply parentheses

3a-63-78=0

We add all the numbers together, and all the variables

3a-141=0

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

3a=141

a=141/3

a=47

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