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13x-1=199-7x
We move all terms to the left:
13x-1-(199-7x)=0
We add all the numbers together, and all the variables
13x-(-7x+199)-1=0
We get rid of parentheses
13x+7x-199-1=0
We add all the numbers together, and all the variables
20x-200=0
We move all terms containing x to the left, all other terms to the right
20x=200
x=200/20
x=10
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