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18x+9=20x-5
We move all terms to the left:
18x+9-(20x-5)=0
We get rid of parentheses
18x-20x+5+9=0
We add all the numbers together, and all the variables
-2x+14=0
We move all terms containing x to the left, all other terms to the right
-2x=-14
x=-14/-2
x=+7
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