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4x-12-12x-3=4x-9x+9
We move all terms to the left:
4x-12-12x-3-(4x-9x+9)=0
We add all the numbers together, and all the variables
4x-12x-(-5x+9)-12-3=0
We add all the numbers together, and all the variables
-8x-(-5x+9)-15=0
We get rid of parentheses
-8x+5x-9-15=0
We add all the numbers together, and all the variables
-3x-24=0
We move all terms containing x to the left, all other terms to the right
-3x=24
x=24/-3
x=-8
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