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67=6x+13
We move all terms to the left:
67-(6x+13)=0
We get rid of parentheses
-6x-13+67=0
We add all the numbers together, and all the variables
-6x+54=0
We move all terms containing x to the left, all other terms to the right
-6x=-54
x=-54/-6
x=+9
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