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7+7(a+8)=98
We move all terms to the left:
7+7(a+8)-(98)=0
We add all the numbers together, and all the variables
7(a+8)-91=0
We multiply parentheses
7a+56-91=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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