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7(a-6)=-28
We move all terms to the left:
7(a-6)-(-28)=0
We add all the numbers together, and all the variables
7(a-6)+28=0
We multiply parentheses
7a-42+28=0
We add all the numbers together, and all the variables
7a-14=0
We move all terms containing a to the left, all other terms to the right
7a=14
a=14/7
a=2
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