7(a-1)=28

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Solution for 7(a-1)=28 equation: 



7(a-1)=28

We move all terms to the left:

7(a-1)-(28)=0

We multiply parentheses

7a-7-28=0

We add all the numbers together, and all the variables

7a-35=0

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

7a=35

a=35/7

a=5

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