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13=5x+6+2x
We move all terms to the left:
13-(5x+6+2x)=0
We add all the numbers together, and all the variables
-(7x+6)+13=0
We get rid of parentheses
-7x-6+13=0
We add all the numbers together, and all the variables
-7x+7=0
We move all terms containing x to the left, all other terms to the right
-7x=-7
x=-7/-7
x=1
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