7(a-1)=13

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Solution for 7(a-1)=13 equation: 



7(a-1)=13

We move all terms to the left:

7(a-1)-(13)=0

We multiply parentheses

7a-7-13=0

We add all the numbers together, and all the variables

7a-20=0

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

7a=20

a=20/7

a=2+6/7

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