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-9x+12+3x=-6x+24-3x-72
We move all terms to the left:
-9x+12+3x-(-6x+24-3x-72)=0
We add all the numbers together, and all the variables
-9x+3x-(-9x-48)+12=0
We add all the numbers together, and all the variables
-6x-(-9x-48)+12=0
We get rid of parentheses
-6x+9x+48+12=0
We add all the numbers together, and all the variables
3x+60=0
We move all terms containing x to the left, all other terms to the right
3x=-60
x=-60/3
x=-20
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