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9x=45+18x
We move all terms to the left:
9x-(45+18x)=0
We add all the numbers together, and all the variables
9x-(18x+45)=0
We get rid of parentheses
9x-18x-45=0
We add all the numbers together, and all the variables
-9x-45=0
We move all terms containing x to the left, all other terms to the right
-9x=45
x=45/-9
x=-5
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