7(1+6a)=21

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Solution for 7(1+6a)=21 equation: 



7(1+6a)=21

We move all terms to the left:

7(1+6a)-(21)=0

We add all the numbers together, and all the variables

7(6a+1)-21=0

We multiply parentheses

42a+7-21=0

We add all the numbers together, and all the variables

42a-14=0

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

42a=14

a=14/42

a=1/3

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