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7x+8(7x-7)=385
We move all terms to the left:
7x+8(7x-7)-(385)=0
We multiply parentheses
7x+56x-56-385=0
We add all the numbers together, and all the variables
63x-441=0
We move all terms containing x to the left, all other terms to the right
63x=441
x=441/63
x=7
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