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7x+9=14x-9
We move all terms to the left:
7x+9-(14x-9)=0
We get rid of parentheses
7x-14x+9+9=0
We add all the numbers together, and all the variables
-7x+18=0
We move all terms containing x to the left, all other terms to the right
-7x=-18
x=-18/-7
x=2+4/7
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