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18x-7=-18x+9
We move all terms to the left:
18x-7-(-18x+9)=0
We get rid of parentheses
18x+18x-9-7=0
We add all the numbers together, and all the variables
36x-16=0
We move all terms containing x to the left, all other terms to the right
36x=16
x=16/36
x=4/9
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