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4x-12-8x+9=18-5x
We move all terms to the left:
4x-12-8x+9-(18-5x)=0
We add all the numbers together, and all the variables
4x-8x-(-5x+18)-12+9=0
We add all the numbers together, and all the variables
-4x-(-5x+18)-3=0
We get rid of parentheses
-4x+5x-18-3=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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