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49=x+6x
We move all terms to the left:
49-(x+6x)=0
We add all the numbers together, and all the variables
-(+7x)+49=0
We get rid of parentheses
-7x+49=0
We move all terms containing x to the left, all other terms to the right
-7x=-49
x=-49/-7
x=+7
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