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8(7+7x)=336
We move all terms to the left:
8(7+7x)-(336)=0
We add all the numbers together, and all the variables
8(7x+7)-336=0
We multiply parentheses
56x+56-336=0
We add all the numbers together, and all the variables
56x-280=0
We move all terms containing x to the left, all other terms to the right
56x=280
x=280/56
x=5
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