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