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6x+12-21x=33-6x
We move all terms to the left:
6x+12-21x-(33-6x)=0
We add all the numbers together, and all the variables
6x-21x-(-6x+33)+12=0
We add all the numbers together, and all the variables
-15x-(-6x+33)+12=0
We get rid of parentheses
-15x+6x-33+12=0
We add all the numbers together, and all the variables
-9x-21=0
We move all terms containing x to the left, all other terms to the right
-9x=21
x=21/-9
x=-2+1/3
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