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18x+3=16x+9
We move all terms to the left:
18x+3-(16x+9)=0
We get rid of parentheses
18x-16x-9+3=0
We add all the numbers together, and all the variables
2x-6=0
We move all terms containing x to the left, all other terms to the right
2x=6
x=6/2
x=3
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